18998880 has 48 divisors (see below), whose sum is σ = 59847984. Its totient is φ = 5066240.

The previous prime is 18998873. The next prime is 18998887. The reversal of 18998880 is 8889981.

It is an interprime number because it is at equal distance from previous prime (18998873) and next prime (18998887).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18998887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19311 + ... + 20270.

It is an arithmetic number, because the mean of its divisors is an integer number (1246833).

Almost surely, 2^18998880 is an apocalyptic number.

18998880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18998880 is an abundant number, since it is smaller than the sum of its proper divisors (40849104).

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

18998880 is a wasteful number, since it uses less digits than its factorization.

18998880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39599 (or 39591 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 51.

The square root of 18998880 is about 4358.7704688364. The cubic root of 18998880 is about 266.8349215940.

The spelling of 18998880 in words is "eighteen million, nine hundred ninety-eight thousand, eight hundred eighty".