990617 has 4 divisors (see below), whose sum is σ = 992976. Its totient is φ = 988260.

The previous prime is 990599. The next prime is 990631. The reversal of 990617 is 716099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716099 = 137 ⋅5227.

It is a cyclic number.

It is not a de Polignac number, because 990617 - 2⁸ = 990361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 1452.

It is an arithmetic number, because the mean of its divisors is an integer number (248244).

2⁹⁹⁰⁶¹⁷ is an apocalyptic number.

It is an amenable number.

990617 is a deficient number, since it is larger than the sum of its proper divisors (2359).

990617 is a wasteful number, since it uses less digits than its factorization.

990617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 990617 is about 995.2974429787. The cubic root of 990617 is about 99.6862499720.

The spelling of 990617 in words is "nine hundred ninety thousand, six hundred seventeen".