18672232 has 16 divisors (see below), whose sum is σ = 35491140. Its totient is φ = 9207936.

The previous prime is 18672221. The next prime is 18672253. The reversal of 18672232 is 23227681.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 1976836 = 4086^2 + 1406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18672194 and 18672203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15403 + ... + 16570.

Almost surely, 2^18672232 is an apocalyptic number.

It is an amenable number.

18672232 is a deficient number, since it is larger than the sum of its proper divisors (16818908).

18672232 is a wasteful number, since it uses less digits than its factorization.

18672232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32052 (or 32048 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 18672232 is about 4321.1378131228. The cubic root of 18672232 is about 265.2968407399.

The spelling of 18672232 in words is "eighteen million, six hundred seventy-two thousand, two hundred thirty-two".