18366444 has 18 divisors (see below), whose sum is σ = 46426380. Its totient is φ = 6122136.

The previous prime is 18366437. The next prime is 18366449. The reversal of 18366444 is 44466381.

18366444 is a `hidden beast` number, since 1 + 8 + 3 + 6 + 644 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 510179 = 18366444 / (1 + 8 + 3 + 6 + 6 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 18366399 and 18366408.

It is not an unprimeable number, because it can be changed into a prime (18366449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255054 + ... + 255125.

Almost surely, 2^18366444 is an apocalyptic number.

It is an amenable number.

18366444 is an abundant number, since it is smaller than the sum of its proper divisors (28059936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18366444 is a wasteful number, since it uses less digits than its factorization.

18366444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510189 (or 510184 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 18366444 is about 4285.6089415624. The cubic root of 18366444 is about 263.8406407394.

The spelling of 18366444 in words is "eighteen million, three hundred sixty-six thousand, four hundred forty-four".