18638324 has 12 divisors (see below), whose sum is σ = 34535844. Its totient is φ = 8770944.

The previous prime is 18638317. The next prime is 18638327. The reversal of 18638324 is 42383681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11971600 + 6666724 = 3460^2 + 2582^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18638327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136979 + ... + 137114.

It is an arithmetic number, because the mean of its divisors is an integer number (2877987).

Almost surely, 2^18638324 is an apocalyptic number.

It is an amenable number.

18638324 is a deficient number, since it is larger than the sum of its proper divisors (15897520).

18638324 is a wasteful number, since it uses less digits than its factorization.

18638324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274114 (or 274112 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 18638324 is about 4317.2125266195. The cubic root of 18638324 is about 265.1361540753.

The spelling of 18638324 in words is "eighteen million, six hundred thirty-eight thousand, three hundred twenty-four".