18638700 has 36 divisors (see below), whose sum is σ = 53928840. Its totient is φ = 4970240.

The previous prime is 18638693. The next prime is 18638701. The reversal of 18638700 is 783681.

It is a super-2 number, since 2×18638700² = 694802275380000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18638701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30765 + ... + 31364.

Almost surely, 2^18638700 is an apocalyptic number.

18638700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18638700 is an abundant number, since it is smaller than the sum of its proper divisors (35290140).

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

18638700 is a wasteful number, since it uses less digits than its factorization.

18638700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62146 (or 62139 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18638700 is about 4317.2560730167. The cubic root of 18638700 is about 265.1379369703.

The spelling of 18638700 in words is "eighteen million, six hundred thirty-eight thousand, seven hundred".