18718924 has 12 divisors (see below), whose sum is σ = 37437904. Its totient is φ = 8022384.

The previous prime is 18718883. The next prime is 18718927. The reversal of 18718924 is 42981781.

It is a happy number.

18718924 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18718927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334239 + ... + 334294.

Almost surely, 2^18718924 is an apocalyptic number.

18718924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18718924 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18718924 is a wasteful number, since it uses less digits than its factorization.

18718924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668544 (or 668542 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 18718924 is about 4326.5371834759. The cubic root of 18718924 is about 265.5177914576.

The spelling of 18718924 in words is "eighteen million, seven hundred eighteen thousand, nine hundred twenty-four".