18156244 has 12 divisors (see below), whose sum is σ = 31969504. Its totient is φ = 9022104.

The previous prime is 18156227. The next prime is 18156251. The reversal of 18156244 is 44265181.

It is a congruent number.

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, 13272 + ... + 14575.

Almost surely, 2^18156244 is an apocalyptic number.

It is an amenable number.

18156244 is a deficient number, since it is larger than the sum of its proper divisors (13813260).

18156244 is a wasteful number, since it uses less digits than its factorization.

18156244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28014 (or 28012 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 18156244 is about 4261.0144332072. The cubic root of 18156244 is about 262.8302431628.

The spelling of 18156244 in words is "eighteen million, one hundred fifty-six thousand, two hundred forty-four".