18712938 has 16 divisors (see below), whose sum is σ = 39053376. Its totient is φ = 5966400.

The previous prime is 18712921. The next prime is 18712943. The reversal of 18712938 is 83921781.

It is a junction number, because it is equal to n+sod(n) for n = 18712896 and 18712905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67663 + ... + 67938.

It is an arithmetic number, because the mean of its divisors is an integer number (2440836).

Almost surely, 2^18712938 is an apocalyptic number.

18712938 is an abundant number, since it is smaller than the sum of its proper divisors (20340438).

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

18712938 is a wasteful number, since it uses less digits than its factorization.

18712938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135629.

The product of its digits is 24192, while the sum is 39.

The square root of 18712938 is about 4325.8453509112. The cubic root of 18712938 is about 265.4894857182.

The spelling of 18712938 in words is "eighteen million, seven hundred twelve thousand, nine hundred thirty-eight".