18108432 has 30 divisors (see below), whose sum is σ = 50678862. Its totient is φ = 6036096.

The previous prime is 18108427. The next prime is 18108439. The reversal of 18108432 is 23480181.

It can be written as a sum of positive squares in only one way, i.e., 17842176 + 266256 = 4224^2 + 516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18108396 and 18108405.

It is not an unprimeable number, because it can be changed into a prime (18108439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62733 + ... + 63020.

Almost surely, 2^18108432 is an apocalyptic number.

18108432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18108432 is an abundant number, since it is smaller than the sum of its proper divisors (32570430).

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

18108432 is a wasteful number, since it uses less digits than its factorization.

18108432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125767 (or 125758 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18108432 is about 4255.4003336936. The cubic root of 18108432 is about 262.5993311154.

The spelling of 18108432 in words is "eighteen million, one hundred eight thousand, four hundred thirty-two".