18215332 has 12 divisors (see below), whose sum is σ = 32399836. Its totient is φ = 8958240.

The previous prime is 18215299. The next prime is 18215371. The reversal of 18215332 is 23351281.

It can be written as a sum of positive squares in 2 ways, for example, as 6885376 + 11329956 = 2624^2 + 3366^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18215297 and 18215306.

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, 37083 + ... + 37570.

Almost surely, 2^18215332 is an apocalyptic number.

It is an amenable number.

18215332 is a deficient number, since it is larger than the sum of its proper divisors (14184504).

18215332 is a wasteful number, since it uses less digits than its factorization.

18215332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74718 (or 74716 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 18215332 is about 4267.9423613727. The cubic root of 18215332 is about 263.1150542108.

The spelling of 18215332 in words is "eighteen million, two hundred fifteen thousand, three hundred thirty-two".