18442664 has 8 divisors (see below), whose sum is σ = 34580010. Its totient is φ = 9221328.

The previous prime is 18442663. The next prime is 18442667. The reversal of 18442664 is 46624481.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 209764 = 4270^2 + 458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18442663) 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 as a sum of consecutive naturals, namely, 1152659 + ... + 1152674.

Almost surely, 2^18442664 is an apocalyptic number.

It is an amenable number.

18442664 is a deficient number, since it is larger than the sum of its proper divisors (16137346).

18442664 is a wasteful number, since it uses less digits than its factorization.

18442664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305339 (or 2305335 counting only the distinct ones).

The product of its digits is 36864, while the sum is 35.

The square root of 18442664 is about 4294.4922866388. The cubic root of 18442664 is about 264.2051130187.

The spelling of 18442664 in words is "eighteen million, four hundred forty-two thousand, six hundred sixty-four".