18713232 has 30 divisors (see below), whose sum is σ = 52371462. Its totient is φ = 6237696.

The previous prime is 18713183. The next prime is 18713249. The reversal of 18713232 is 23231781.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 2359296 = 4044^2 + 1536^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18713196 and 18713205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64833 + ... + 65120.

Almost surely, 2^18713232 is an apocalyptic number.

18713232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18713232 is an abundant number, since it is smaller than the sum of its proper divisors (33658230).

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

18713232 is a wasteful number, since it uses less digits than its factorization.

18713232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129967 (or 129958 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18713232 is about 4325.8793325751. The cubic root of 18713232 is about 265.4908760843.

The spelling of 18713232 in words is "eighteen million, seven hundred thirteen thousand, two hundred thirty-two".