18408722 has 12 divisors (see below), whose sum is σ = 29333850. Its totient is φ = 8662656.

The previous prime is 18408679. The next prime is 18408737. The reversal of 18408722 is 22780481.

It can be written as a sum of positive squares in 3 ways, for example, as 18241441 + 167281 = 4271^2 + 409^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15347 + ... + 16502.

Almost surely, 2^18408722 is an apocalyptic number.

18408722 is a deficient number, since it is larger than the sum of its proper divisors (10925128).

18408722 is a wasteful number, since it uses less digits than its factorization.

18408722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31885 (or 31868 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18408722 is about 4290.5386608210. The cubic root of 18408722 is about 264.0429318763.

The spelling of 18408722 in words is "eighteen million, four hundred eight thousand, seven hundred twenty-two".