18831132 has 36 divisors (see below), whose sum is σ = 47732776. Its totient is φ = 6259680.

The previous prime is 18831107. The next prime is 18831139. The reversal of 18831132 is 23113881.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18831132² = 709223064802848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18831096 and 18831105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18831139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24498 + ... + 25254.

Almost surely, 2^18831132 is an apocalyptic number.

18831132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18831132 is an abundant number, since it is smaller than the sum of its proper divisors (28901644).

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

18831132 is a wasteful number, since it uses less digits than its factorization.

18831132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458 (or 1453 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 18831132 is about 4339.4852229268. The cubic root of 18831132 is about 266.0472714526.

The spelling of 18831132 in words is "eighteen million, eight hundred thirty-one thousand, one hundred thirty-two".