991379876 has 12 divisors (see below), whose sum is σ = 1790880000. Its totient is φ = 479699880.

The previous prime is 991379861. The next prime is 991379881. The reversal of 991379876 is 678973199.

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, 3997376 + ... + 3997623.

It is an arithmetic number, because the mean of its divisors is an integer number (149240000).

Almost surely, 2^991379876 is an apocalyptic number.

It is an amenable number.

991379876 is a deficient number, since it is larger than the sum of its proper divisors (799500124).

991379876 is a wasteful number, since it uses less digits than its factorization.

991379876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7995034 (or 7995032 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 59.

The square root of 991379876 is about 31486.1854787143. The cubic root of 991379876 is about 997.1183292837.

The spelling of 991379876 in words is "nine hundred ninety-one million, three hundred seventy-nine thousand, eight hundred seventy-six".