990791 has 6 divisors (see below), whose sum is σ = 1024776. Its totient is φ = 957900.

The previous prime is 990767. The next prime is 990797. The reversal of 990791 is 197099.

It is a happy number.

It is not a de Polignac number, because 990791 - 2¹⁸ = 728647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990797) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 446 + ... + 1476.

It is an arithmetic number, because the mean of its divisors is an integer number (170796).

2⁹⁹⁰⁷⁹¹ is an apocalyptic number.

990791 is a deficient number, since it is larger than the sum of its proper divisors (33985).

990791 is a wasteful number, since it uses less digits than its factorization.

990791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 990791 is about 995.3848501961. The cubic root of 990791 is about 99.6920861974.

The spelling of 990791 in words is "nine hundred ninety thousand, seven hundred ninety-one".