18722988 has 30 divisors (see below), whose sum is σ = 48946436. Its totient is φ = 6240888.

The previous prime is 18722987. The next prime is 18723011. The reversal of 18722988 is 88922781.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18722981) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28570 + ... + 29217.

Almost surely, 2^18722988 is an apocalyptic number.

18722988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18722988 is an abundant number, since it is smaller than the sum of its proper divisors (30223448).

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

18722988 is a wasteful number, since it uses less digits than its factorization.

18722988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57803 (or 57792 counting only the distinct ones).

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

The square root of 18722988 is about 4327.0068176512. The cubic root of 18722988 is about 265.5370052796.

The spelling of 18722988 in words is "eighteen million, seven hundred twenty-two thousand, nine hundred eighty-eight".