990879185 has 16 divisors (see below), whose sum is σ = 1230142032. Its totient is φ = 765696000.

The previous prime is 990879179. The next prime is 990879193. The reversal of 990879185 is 581978099.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1336336 + 989542849 = 1156^2 + 31457^2 .

It is not a de Polignac number, because 990879185 - 2⁶ = 990879121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990879185.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3224 + ... + 44633.

It is an arithmetic number, because the mean of its divisors is an integer number (76883877).

Almost surely, 2^990879185 is an apocalyptic number.

It is an amenable number.

990879185 is a deficient number, since it is larger than the sum of its proper divisors (239262847).

990879185 is a wasteful number, since it uses less digits than its factorization.

990879185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48004.

The product of its (nonzero) digits is 1632960, while the sum is 56.

The square root of 990879185 is about 31478.2335114282. The cubic root of 990879185 is about 996.9504379582.

The spelling of 990879185 in words is "nine hundred ninety million, eight hundred seventy-nine thousand, one hundred eighty-five".