18987888 has 20 divisors (see below), whose sum is σ = 49052168. Its totient is φ = 6329280.

The previous prime is 18987877. The next prime is 18987889. The reversal of 18987888 is 88878981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197743 + ... + 197838.

Almost surely, 2^18987888 is an apocalyptic number.

It is an amenable number.

18987888 is an abundant number, since it is smaller than the sum of its proper divisors (30064280).

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

18987888 is a wasteful number, since it uses less digits than its factorization.

18987888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395592 (or 395586 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 57.

The square root of 18987888 is about 4357.5093803686. The cubic root of 18987888 is about 266.7834516251.

The spelling of 18987888 in words is "eighteen million, nine hundred eighty-seven thousand, eight hundred eighty-eight".