990717 has 32 divisors (see below), whose sum is σ = 1720320. Its totient is φ = 492480.

The previous prime is 990707. The next prime is 990719. The reversal of 990717 is 717099.

It is not a de Polignac number, because 990717 - 2⁷ = 990589 is a prime.

990717 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5092 + ... + 5282.

It is an arithmetic number, because the mean of its divisors is an integer number (53760).

2⁹⁹⁰⁷¹⁷ is an apocalyptic number.

It is an amenable number.

990717 is a deficient number, since it is larger than the sum of its proper divisors (729603).

990717 is a wasteful number, since it uses less digits than its factorization.

990717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its (nonzero) digits is 3969, while the sum is 33.

The square root of 990717 is about 995.3476779498. The cubic root of 990717 is about 99.6896042080.

The spelling of 990717 in words is "nine hundred ninety thousand, seven hundred seventeen".