18164644 has 9 divisors (see below), whose sum is σ = 31803051. Its totient is φ = 9078060.

The previous prime is 18164639. The next prime is 18164647. The reversal of 18164644 is 44646181.

The square root of 18164644 is 4262.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18164647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7459 + ... + 9589.

Almost surely, 2^18164644 is an apocalyptic number.

18164644 is the 4262-nd square number.

It is an amenable number.

18164644 is a deficient number, since it is larger than the sum of its proper divisors (13638407).

18164644 is an frugal number, since it uses more digits than its factorization.

18164644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266 (or 2133 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The cubic root of 18164644 is about 262.8707697837.

The spelling of 18164644 in words is "eighteen million, one hundred sixty-four thousand, six hundred forty-four".