18738864 has 100 divisors (see below), whose sum is σ = 57165240. Its totient is φ = 5909760.

The previous prime is 18738851. The next prime is 18738869. The reversal of 18738864 is 46883781.

It is a super-2 number, since 2×18738864² = 702290048020992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18738869) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24244 + ... + 25004.

Almost surely, 2^18738864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18738864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28582620).

18738864 is an abundant number, since it is smaller than the sum of its proper divisors (38426376).

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

18738864 is a wasteful number, since it uses less digits than its factorization.

18738864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 785 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 18738864 is about 4328.8409534193. The cubic root of 18738864 is about 265.6120373651.

The spelling of 18738864 in words is "eighteen million, seven hundred thirty-eight thousand, eight hundred sixty-four".