18918836 has 12 divisors (see below), whose sum is σ = 33177312. Its totient is φ = 9439608.

The previous prime is 18918829. The next prime is 18918859. The reversal of 18918836 is 63881981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 2690 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (2764776).

Almost surely, 2^18918836 is an apocalyptic number.

It is an amenable number.

18918836 is a deficient number, since it is larger than the sum of its proper divisors (14258476).

18918836 is a wasteful number, since it uses less digits than its factorization.

18918836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9910 (or 9908 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 18918836 is about 4349.5788301857. The cubic root of 18918836 is about 266.4596608766.

The spelling of 18918836 in words is "eighteen million, nine hundred eighteen thousand, eight hundred thirty-six".