18930438 has 48 divisors (see below), whose sum is σ = 42574896. Its totient is φ = 6074880.

The previous prime is 18930427. The next prime is 18930451. The reversal of 18930438 is 83403981.

It is a super-2 number, since 2×18930438² = 716722965743688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83281 + ... + 83507.

It is an arithmetic number, because the mean of its divisors is an integer number (886977).

Almost surely, 2^18930438 is an apocalyptic number.

18930438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18930438 is an abundant number, since it is smaller than the sum of its proper divisors (23644458).

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

18930438 is a wasteful number, since it uses less digits than its factorization.

18930438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18930438 is about 4350.9123181236. The cubic root of 18930438 is about 266.5141186536.

The spelling of 18930438 in words is "eighteen million, nine hundred thirty thousand, four hundred thirty-eight".