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19889797 = 411373541
BaseRepresentation
bin100101111011…
…1111010000101
31101102111200011
41023313322011
520042433142
61550150221
7331026514
oct113677205
941374604
1019889797
1110255554
1267b2371
134175215
1428da67b
151b2d417
hex12f7e85

19889797 has 8 divisors (see below), whose sum is σ = 20529432. Its totient is φ = 19257600.

The previous prime is 19889791. The next prime is 19889801. The reversal of 19889797 is 79798891.

It can be written as a sum of positive squares in 4 ways, for example, as 256036 + 19633761 = 506^2 + 4431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19889797 - 219 = 19365509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19889791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3847 + ... + 7387.

It is an arithmetic number, because the mean of its divisors is an integer number (2566179).

Almost surely, 219889797 is an apocalyptic number.

It is an amenable number.

19889797 is a deficient number, since it is larger than the sum of its proper divisors (639635).

19889797 is a wasteful number, since it uses less digits than its factorization.

19889797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719.

The product of its digits is 2286144, while the sum is 58.

The square root of 19889797 is about 4459.7978653746. The cubic root of 19889797 is about 270.9422815219.

The spelling of 19889797 in words is "nineteen million, eight hundred eighty-nine thousand, seven hundred ninety-seven".

Divisors: 1 41 137 3541 5617 145181 485117 19889797