18939740 has 12 divisors (see below), whose sum is σ = 39773496. Its totient is φ = 7575888.

The previous prime is 18939727. The next prime is 18939757. The reversal of 18939740 is 4793981.

It is a happy number.

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, 473474 + ... + 473513.

It is an arithmetic number, because the mean of its divisors is an integer number (3314458).

Almost surely, 2^18939740 is an apocalyptic number.

18939740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18939740 is an abundant number, since it is smaller than the sum of its proper divisors (20833756).

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

18939740 is a wasteful number, since it uses less digits than its factorization.

18939740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946996 (or 946994 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18939740 is about 4351.9811580474. The cubic root of 18939740 is about 266.5577645601.

The spelling of 18939740 in words is "eighteen million, nine hundred thirty-nine thousand, seven hundred forty".