990865955 has 8 divisors (see below), whose sum is σ = 1189280832. Its totient is φ = 792531648.

The previous prime is 990865933. The next prime is 990865963. The reversal of 990865955 is 559568099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990865955 - 2¹⁸ = 990603811 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 990865955.

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, 11414 + ... + 45956.

It is an arithmetic number, because the mean of its divisors is an integer number (148660104).

Almost surely, 2^990865955 is an apocalyptic number.

990865955 is a deficient number, since it is larger than the sum of its proper divisors (198414877).

990865955 is a wasteful number, since it uses less digits than its factorization.

990865955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40285.

The product of its (nonzero) digits is 4374000, while the sum is 56.

The square root of 990865955 is about 31478.0233655165. The cubic root of 990865955 is about 996.9460009177.

The spelling of 990865955 in words is "nine hundred ninety million, eight hundred sixty-five thousand, nine hundred fifty-five".