18313864 has 8 divisors (see below), whose sum is σ = 34338510. Its totient is φ = 9156928.

The previous prime is 18313861. The next prime is 18313871. The reversal of 18313864 is 46831381.

It can be written as a sum of positive squares in only one way, i.e., 9253764 + 9060100 = 3042^2 + 3010^2 .

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

It is a super-2 number, since 2×18313864² = 670795229220992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18313861) 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, 1144609 + ... + 1144624.

Almost surely, 2^18313864 is an apocalyptic number.

It is an amenable number.

18313864 is a deficient number, since it is larger than the sum of its proper divisors (16024646).

18313864 is a wasteful number, since it uses less digits than its factorization.

18313864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2289239 (or 2289235 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 18313864 is about 4279.4700606500. The cubic root of 18313864 is about 263.5886231574.

The spelling of 18313864 in words is "eighteen million, three hundred thirteen thousand, eight hundred sixty-four".