18713238 has 16 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 6104936.

The previous prime is 18713183. The next prime is 18713249. The reversal of 18713238 is 83231781.

It is a junction number, because it is equal to n+sod(n) for n = 18713199 and 18713208.

It is a congruent number.

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, 32898 + ... + 33461.

It is an arithmetic number, because the mean of its divisors is an integer number (2388960).

Almost surely, 2^18713238 is an apocalyptic number.

18713238 is an abundant number, since it is smaller than the sum of its proper divisors (19510122).

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

18713238 is a wasteful number, since it uses less digits than its factorization.

18713238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66411.

The product of its digits is 8064, while the sum is 33.

The square root of 18713238 is about 4325.8800260756. The cubic root of 18713238 is about 265.4909044589.

The spelling of 18713238 in words is "eighteen million, seven hundred thirteen thousand, two hundred thirty-eight".