18987480 has 64 divisors (see below), whose sum is σ = 63295200. Its totient is φ = 5063040.

The previous prime is 18987457. The next prime is 18987481. The reversal of 18987480 is 8478981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7711 + ... + 9870.

Almost surely, 2^18987480 is an apocalyptic number.

18987480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18987480 is an abundant number, since it is smaller than the sum of its proper divisors (44307720).

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

18987480 is a wasteful number, since it uses less digits than its factorization.

18987480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17601 (or 17591 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 18987480 is about 4357.4625643831. The cubic root of 18987480 is about 266.7815407854.

The spelling of 18987480 in words is "eighteen million, nine hundred eighty-seven thousand, four hundred eighty".