990493956 has 36 divisors (see below), whose sum is σ = 2590087500. Its totient is φ = 318779328.

The previous prime is 990493939. The next prime is 990493961. The reversal of 990493956 is 659394099.

It can be written as a sum of positive squares in 2 ways, for example, as 173448900 + 817045056 = 13170^2 + 28584^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473331 + ... + 475418.

It is an arithmetic number, because the mean of its divisors is an integer number (71946875).

Almost surely, 2^990493956 is an apocalyptic number.

It is an amenable number.

990493956 is an abundant number, since it is smaller than the sum of its proper divisors (1599593544).

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

990493956 is a wasteful number, since it uses less digits than its factorization.

990493956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948788 (or 948783 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 54.

The square root of 990493956 is about 31472.1139423458. The cubic root of 990493956 is about 996.8212247614.

The spelling of 990493956 in words is "nine hundred ninety million, four hundred ninety-three thousand, nine hundred fifty-six".