990517 has 8 divisors (see below), whose sum is σ = 1101600. Its totient is φ = 882960.

The previous prime is 990511. The next prime is 990523. The reversal of 990517 is 715099.

It is an interprime number because it is at equal distance from previous prime (990511) and next prime (990523).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990517 - 2⁷ = 990389 is a prime.

It is a super-2 number, since 2×990517² = 1962247854578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (137700).

2⁹⁹⁰⁵¹⁷ is an apocalyptic number.

It is an amenable number.

990517 is a deficient number, since it is larger than the sum of its proper divisors (111083).

990517 is a wasteful number, since it uses less digits than its factorization.

990517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 990517 is about 995.2472054721. The cubic root of 990517 is about 99.6828955103.

The spelling of 990517 in words is "nine hundred ninety thousand, five hundred seventeen".