990475 has 6 divisors (see below), whose sum is σ = 1228220. Its totient is φ = 792360.

The previous prime is 990469. The next prime is 990487. The reversal of 990475 is 574099.

It is a de Polignac number, because none of the positive numbers 2^k-990475 is a prime.

It is an Ulam number.

990475 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 990475.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 19785 + ... + 19834.

2⁹⁹⁰⁴⁷⁵ is an apocalyptic number.

990475 is a deficient number, since it is larger than the sum of its proper divisors (237745).

990475 is a wasteful number, since it uses less digits than its factorization.

990475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39629 (or 39624 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 990475 is about 995.2261049631. The cubic root of 990475 is about 99.6814865691.

The spelling of 990475 in words is "nine hundred ninety thousand, four hundred seventy-five".