18336644 has 6 divisors (see below), whose sum is σ = 32089134. Its totient is φ = 9168320.

The previous prime is 18336631. The next prime is 18336667. The reversal of 18336644 is 44663381.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 6002500 = 3512^2 + 2450^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2292077 + ... + 2292084.

It is an arithmetic number, because the mean of its divisors is an integer number (5348189).

Almost surely, 2^18336644 is an apocalyptic number.

It is an amenable number.

18336644 is a deficient number, since it is larger than the sum of its proper divisors (13752490).

18336644 is a wasteful number, since it uses less digits than its factorization.

18336644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584165 (or 4584163 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 18336644 is about 4282.1307780123. The cubic root of 18336644 is about 263.6978675516.

The spelling of 18336644 in words is "eighteen million, three hundred thirty-six thousand, six hundred forty-four".