18738942 has 16 divisors (see below), whose sum is σ = 38687232. Its totient is φ = 6044760.

The previous prime is 18738919. The next prime is 18738943. The reversal of 18738942 is 24983781.

It is a super-2 number, since 2×18738942² = 702295894558728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18738894 and 18738903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50188 + ... + 50559.

It is an arithmetic number, because the mean of its divisors is an integer number (2417952).

Almost surely, 2^18738942 is an apocalyptic number.

18738942 is an abundant number, since it is smaller than the sum of its proper divisors (19948290).

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

18738942 is a wasteful number, since it uses less digits than its factorization.

18738942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100783.

The product of its digits is 96768, while the sum is 42.

The square root of 18738942 is about 4328.8499627499. The cubic root of 18738942 is about 265.6124058988.

The spelling of 18738942 in words is "eighteen million, seven hundred thirty-eight thousand, nine hundred forty-two".