18987464 has 16 divisors (see below), whose sum is σ = 35674800. Its totient is φ = 9474192.

The previous prime is 18987457. The next prime is 18987481. The reversal of 18987464 is 46478981.

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, 2207 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (2229675).

Almost surely, 2^18987464 is an apocalyptic number.

It is an amenable number.

18987464 is a deficient number, since it is larger than the sum of its proper divisors (16687336).

18987464 is a wasteful number, since it uses less digits than its factorization.

18987464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4892 (or 4888 counting only the distinct ones).

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

The square root of 18987464 is about 4357.4607284518. The cubic root of 18987464 is about 266.7814658500.

The spelling of 18987464 in words is "eighteen million, nine hundred eighty-seven thousand, four hundred sixty-four".