990913 has 16 divisors (see below), whose sum is σ = 1309824. Its totient is φ = 725760.

The previous prime is 990893. The next prime is 990917. The reversal of 990913 is 319099.

It is not a de Polignac number, because 990913 - 2⁵ = 990881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 931 + ... + 1687.

It is an arithmetic number, because the mean of its divisors is an integer number (81864).

2⁹⁹⁰⁹¹³ is an apocalyptic number.

It is an amenable number.

990913 is a deficient number, since it is larger than the sum of its proper divisors (318911).

990913 is a wasteful number, since it uses less digits than its factorization.

990913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 990913 is about 995.4461311392. The cubic root of 990913 is about 99.6961778559.

The spelling of 990913 in words is "nine hundred ninety thousand, nine hundred thirteen".