18993132 has 36 divisors (see below), whose sum is σ = 48373416. Its totient is φ = 6283200.

The previous prime is 18993119. The next prime is 18993181. The reversal of 18993132 is 23139981.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3007 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (1343706).

Almost surely, 2^18993132 is an apocalyptic number.

18993132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18993132 is an abundant number, since it is smaller than the sum of its proper divisors (29380284).

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

18993132 is a wasteful number, since it uses less digits than its factorization.

18993132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 3993 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 18993132 is about 4358.1110587042. Note that the first 3 decimals coincide. The cubic root of 18993132 is about 266.8080090982.

The spelling of 18993132 in words is "eighteen million, nine hundred ninety-three thousand, one hundred thirty-two".