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138917688 = 23371363607
BaseRepresentation
bin10000100011110…
…11011100111000
3100200101202020120
420101323130320
5241030331223
621441253240
73304531560
oct1021733470
9320352216
10138917688
1171462a08
123a634220
1322a1b820
1414641da0
15c2e0be3
hex847b738

138917688 has 64 divisors (see below), whose sum is σ = 427445760. Its totient is φ = 36637056.

The previous prime is 138917687. The next prime is 138917699. The reversal of 138917688 is 886719831.

138917688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138917688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138917687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29620 + ... + 33987.

It is an arithmetic number, because the mean of its divisors is an integer number (6678840).

Almost surely, 2138917688 is an apocalyptic number.

It is an amenable number.

138917688 is an abundant number, since it is smaller than the sum of its proper divisors (288528072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138917688 is a wasteful number, since it uses less digits than its factorization.

138917688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63636 (or 63632 counting only the distinct ones).

The product of its digits is 580608, while the sum is 51.

The square root of 138917688 is about 11786.3347992495. The cubic root of 138917688 is about 517.9078760656.

The spelling of 138917688 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, six hundred eighty-eight".

Divisors: 1 2 3 4 6 7 8 12 13 14 21 24 26 28 39 42 52 56 78 84 91 104 156 168 182 273 312 364 546 728 1092 2184 63607 127214 190821 254428 381642 445249 508856 763284 826891 890498 1335747 1526568 1653782 1780996 2480673 2671494 3307564 3561992 4961346 5342988 5788237 6615128 9922692 10685976 11576474 17364711 19845384 23152948 34729422 46305896 69458844 138917688