18937040 has 20 divisors (see below), whose sum is σ = 44028804. Its totient is φ = 7574784.

The previous prime is 18937033. The next prime is 18937103. The reversal of 18937040 is 4073981.

It can be written as a sum of positive squares in 2 ways, for example, as 10316944 + 8620096 = 3212^2 + 2936^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×18937040² = 717222967923200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18936988 and 18937006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118277 + ... + 118436.

Almost surely, 2^18937040 is an apocalyptic number.

18937040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18937040 is an abundant number, since it is smaller than the sum of its proper divisors (25091764).

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

18937040 is a wasteful number, since it uses less digits than its factorization.

18937040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236726 (or 236720 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18937040 is about 4351.6709434423. The cubic root of 18937040 is about 266.5450973646.

The spelling of 18937040 in words is "eighteen million, nine hundred thirty-seven thousand, forty".