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18019944 = 2332353709
BaseRepresentation
bin100010010111…
…1011001101000
31020220111201100
41010233121220
514103114234
61442121400
7306111165
oct104573150
936814640
1018019944
11a198718
126050260
13396c0b7
14257106c
1518ae399
hex112f668

18019944 has 48 divisors (see below), whose sum is σ = 49011300. Its totient is φ = 5981184.

The previous prime is 18019943. The next prime is 18019993. The reversal of 18019944 is 44991081.

It can be written as a sum of positive squares in 2 ways, for example, as 16892100 + 1127844 = 4110^2 + 1062^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18019899 and 18019908.

It is not an unprimeable number, because it can be changed into a prime (18019943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25062 + ... + 25770.

Almost surely, 218019944 is an apocalyptic number.

It is an amenable number.

18019944 is an abundant number, since it is smaller than the sum of its proper divisors (30991356).

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

18019944 is a wasteful number, since it uses less digits than its factorization.

18019944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18019944 is about 4244.9904593532. The cubic root of 18019944 is about 262.1708964096.

The spelling of 18019944 in words is "eighteen million, nineteen thousand, nine hundred forty-four".

Divisors: 1 2 3 4 6 8 9 12 18 24 36 72 353 706 709 1059 1412 1418 2118 2127 2824 2836 3177 4236 4254 5672 6354 6381 8472 8508 12708 12762 17016 25416 25524 51048 250277 500554 750831 1001108 1501662 2002216 2252493 3003324 4504986 6006648 9009972 18019944