18208964 has 12 divisors (see below), whose sum is σ = 31991484. Its totient is φ = 9068544.

The previous prime is 18208963. The next prime is 18208979. The reversal of 18208964 is 46980281.

It can be written as a sum of positive squares in 2 ways, for example, as 17556100 + 652864 = 4190^2 + 808^2 .

It is not an unprimeable number, because it can be changed into a prime (18208963) 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 3 ways as a sum of consecutive naturals, for example, 7829 + ... + 9884.

It is an arithmetic number, because the mean of its divisors is an integer number (2665957).

Almost surely, 2^18208964 is an apocalyptic number.

It is an amenable number.

18208964 is a deficient number, since it is larger than the sum of its proper divisors (13782520).

18208964 is a wasteful number, since it uses less digits than its factorization.

18208964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17974 (or 17972 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 18208964 is about 4267.1962692147. The cubic root of 18208964 is about 263.0843893482.

The spelling of 18208964 in words is "eighteen million, two hundred eight thousand, nine hundred sixty-four".