18987522 has 16 divisors (see below), whose sum is σ = 38022240. Its totient is φ = 6321312.

The previous prime is 18987511. The next prime is 18987541. The reversal of 18987522 is 22578981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5373 + ... + 8175.

It is an arithmetic number, because the mean of its divisors is an integer number (2376390).

Almost surely, 2^18987522 is an apocalyptic number.

18987522 is an abundant number, since it is smaller than the sum of its proper divisors (19034718).

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

18987522 is a wasteful number, since it uses less digits than its factorization.

18987522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937.

The product of its digits is 80640, while the sum is 42.

The square root of 18987522 is about 4357.4673836989. The cubic root of 18987522 is about 266.7817374908.

The spelling of 18987522 in words is "eighteen million, nine hundred eighty-seven thousand, five hundred twenty-two".