18431372 has 12 divisors (see below), whose sum is σ = 33657456. Its totient is φ = 8814960.

The previous prime is 18431353. The next prime is 18431377. The reversal of 18431372 is 27313481.

It is not an unprimeable number, because it can be changed into a prime (18431377) 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, 100079 + ... + 100262.

It is an arithmetic number, because the mean of its divisors is an integer number (2804788).

Almost surely, 2^18431372 is an apocalyptic number.

It is an amenable number.

18431372 is a deficient number, since it is larger than the sum of its proper divisors (15226084).

18431372 is a wasteful number, since it uses less digits than its factorization.

18431372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200368 (or 200366 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 18431372 is about 4293.1773781198. The cubic root of 18431372 is about 264.1511798626.

The spelling of 18431372 in words is "eighteen million, four hundred thirty-one thousand, three hundred seventy-two".