18739924 has 12 divisors (see below), whose sum is σ = 37479904. Its totient is φ = 8031384.

The previous prime is 18739907. The next prime is 18739937. The reversal of 18739924 is 42993781.

18739924 is an admirable number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 334614 + ... + 334669.

Almost surely, 2^18739924 is an apocalyptic number.

18739924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18739924 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.

18739924 is a wasteful number, since it uses less digits than its factorization.

18739924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669294 (or 669292 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 18739924 is about 4328.9633863086. The cubic root of 18739924 is about 265.6170455565.

The spelling of 18739924 in words is "eighteen million, seven hundred thirty-nine thousand, nine hundred twenty-four".