919899980 has 24 divisors (see below), whose sum is σ = 1972893888. Its totient is φ = 360130688.

The previous prime is 919899979. The next prime is 919900001. The reversal of 919899980 is 89998919.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488369 + ... + 490248.

It is an arithmetic number, because the mean of its divisors is an integer number (82203912).

Almost surely, 2^919899980 is an apocalyptic number.

It is an amenable number.

919899980 is an abundant number, since it is smaller than the sum of its proper divisors (1052993908).

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

919899980 is a wasteful number, since it uses less digits than its factorization.

919899980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978673 (or 978671 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 62.

The square root of 919899980 is about 30329.8529505173. The cubic root of 919899980 is about 972.5535791682.

The spelling of 919899980 in words is "nine hundred nineteen million, eight hundred ninety-nine thousand, nine hundred eighty".