990775 has 6 divisors (see below), whose sum is σ = 1228592. Its totient is φ = 792600.

The previous prime is 990767. The next prime is 990797. The reversal of 990775 is 577099.

It is not a de Polignac number, because 990775 - 2³ = 990767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19791 + ... + 19840.

2⁹⁹⁰⁷⁷⁵ is an apocalyptic number.

990775 is a deficient number, since it is larger than the sum of its proper divisors (237817).

990775 is a wasteful number, since it uses less digits than its factorization.

990775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39641 (or 39636 counting only the distinct ones).

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 990775 is about 995.3768130713. The cubic root of 990775 is about 99.6915495615.

The spelling of 990775 in words is "nine hundred ninety thousand, seven hundred seventy-five".