18988540 has 12 divisors (see below), whose sum is σ = 39875976. Its totient is φ = 7595408.

The previous prime is 18988483. The next prime is 18988573. The reversal of 18988540 is 4588981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474694 + ... + 474733.

It is an arithmetic number, because the mean of its divisors is an integer number (3322998).

Almost surely, 2^18988540 is an apocalyptic number.

18988540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18988540 is an abundant number, since it is smaller than the sum of its proper divisors (20887436).

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

18988540 is a wasteful number, since it uses less digits than its factorization.

18988540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949436 (or 949434 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 43.

The square root of 18988540 is about 4357.5841931052. The cubic root of 18988540 is about 266.7865051650.

The spelling of 18988540 in words is "eighteen million, nine hundred eighty-eight thousand, five hundred forty".