990438965 has 4 divisors (see below), whose sum is σ = 1188526764. Its totient is φ = 792351168.

The previous prime is 990438941. The next prime is 990438971. The reversal of 990438965 is 569834099.

990438965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155575729 + 834863236 = 12473^2 + 28894^2 .

It is a cyclic number.

It is not a de Polignac number, because 990438965 - 2¹⁶ = 990373429 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 99043892 + ... + 99043901.

It is an arithmetic number, because the mean of its divisors is an integer number (297131691).

Almost surely, 2^990438965 is an apocalyptic number.

It is an amenable number.

990438965 is a deficient number, since it is larger than the sum of its proper divisors (198087799).

990438965 is a wasteful number, since it uses less digits than its factorization.

990438965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198087798.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 990438965 is about 31471.2402837893. The cubic root of 990438965 is about 996.8027769926.

The spelling of 990438965 in words is "nine hundred ninety million, four hundred thirty-eight thousand, nine hundred sixty-five".