990747 has 6 divisors (see below), whose sum is σ = 1431092. Its totient is φ = 660492.

The previous prime is 990733. The next prime is 990761. The reversal of 990747 is 747099.

It is an interprime number because it is at equal distance from previous prime (990733) and next prime (990761).

It is a de Polignac number, because none of the positive numbers 2^k-990747 is a prime.

It is a Duffinian number.

990747 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990747.

It is not an unprimeable number, because it can be changed into a prime (990707) 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, 55033 + ... + 55050.

2⁹⁹⁰⁷⁴⁷ is an apocalyptic number.

990747 is a deficient number, since it is larger than the sum of its proper divisors (440345).

990747 is a wasteful number, since it uses less digits than its factorization.

990747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110089 (or 110086 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 990747 is about 995.3627479467. The cubic root of 990747 is about 99.6906104348.

The spelling of 990747 in words is "nine hundred ninety thousand, seven hundred forty-seven".