18986744 has 16 divisors (see below), whose sum is σ = 40686000. Its totient is φ = 8137152.

The previous prime is 18986699. The next prime is 18986767. The reversal of 18986744 is 44768981.

It is a congruent number.

It is an unprimeable number.

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, 169469 + ... + 169580.

It is an arithmetic number, because the mean of its divisors is an integer number (2542875).

Almost surely, 2^18986744 is an apocalyptic number.

18986744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18986744 is an abundant number, since it is smaller than the sum of its proper divisors (21699256).

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

18986744 is a wasteful number, since it uses less digits than its factorization.

18986744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339062 (or 339058 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 18986744 is about 4357.3781107450. The cubic root of 18986744 is about 266.7780937113.

The spelling of 18986744 in words is "eighteen million, nine hundred eighty-six thousand, seven hundred forty-four".