18012432 has 20 divisors (see below), whose sum is σ = 46532240. Its totient is φ = 6004128.

The previous prime is 18012431. The next prime is 18012439. The reversal of 18012432 is 23421081.

It is a junction number, because it is equal to n+sod(n) for n = 18012399 and 18012408.

It is not an unprimeable number, because it can be changed into a prime (18012431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187582 + ... + 187677.

It is an arithmetic number, because the mean of its divisors is an integer number (2326612).

Almost surely, 2^18012432 is an apocalyptic number.

18012432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18012432 is an abundant number, since it is smaller than the sum of its proper divisors (28519808).

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

18012432 is a wasteful number, since it uses less digits than its factorization.

18012432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375270 (or 375264 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18012432 is about 4244.1055594789. The cubic root of 18012432 is about 262.1344608265.

The spelling of 18012432 in words is "eighteen million, twelve thousand, four hundred thirty-two".