18168244 has 6 divisors (see below), whose sum is σ = 31794434. Its totient is φ = 9084120.

The previous prime is 18168217. The next prime is 18168251. The reversal of 18168244 is 44286181.

It can be written as a sum of positive squares in only one way, i.e., 18164644 + 3600 = 4262^2 + 60^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271027 + ... + 2271034.

Almost surely, 2^18168244 is an apocalyptic number.

It is an amenable number.

18168244 is a deficient number, since it is larger than the sum of its proper divisors (13626190).

18168244 is a wasteful number, since it uses less digits than its factorization.

18168244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542065 (or 4542063 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 18168244 is about 4262.4223160076. The cubic root of 18168244 is about 262.8881345108. Note that the first 3 decimals are identical.

The spelling of 18168244 in words is "eighteen million, one hundred sixty-eight thousand, two hundred forty-four".