18992880 has 120 divisors (see below), whose sum is σ = 66214512. Its totient is φ = 5059584.

The previous prime is 18992879. The next prime is 18992903. The reversal of 18992880 is 8829981.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18952 + ... + 19928.

Almost surely, 2^18992880 is an apocalyptic number.

18992880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18992880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33107256).

18992880 is an abundant number, since it is smaller than the sum of its proper divisors (47221632).

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

18992880 is an equidigital number, since it uses as much as digits as its factorization.

18992880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 987 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 18992880 is about 4358.0821470000. The cubic root of 18992880 is about 266.8068290942.

The spelling of 18992880 in words is "eighteen million, nine hundred ninety-two thousand, eight hundred eighty".