18636044 has 12 divisors (see below), whose sum is σ = 37272144. Its totient is φ = 7986864.

The previous prime is 18636041. The next prime is 18636047. The reversal of 18636044 is 44063681.

It is an interprime number because it is at equal distance from previous prime (18636041) and next prime (18636047).

18636044 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18636044.

It is not an unprimeable number, because it can be changed into a prime (18636041) 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, 332759 + ... + 332814.

It is an arithmetic number, because the mean of its divisors is an integer number (3106012).

Almost surely, 2^18636044 is an apocalyptic number.

18636044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18636044 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18636044 is a wasteful number, since it uses less digits than its factorization.

18636044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665584 (or 665582 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 18636044 is about 4316.9484592707. The cubic root of 18636044 is about 265.1253423900.

The spelling of 18636044 in words is "eighteen million, six hundred thirty-six thousand, forty-four".