890665 has 8 divisors (see below), whose sum is σ = 1089288. Its totient is φ = 698880.

The previous prime is 890657. The next prime is 890671. The reversal of 890665 is 566098.

It can be written as a sum of positive squares in 4 ways, for example, as 257049 + 633616 = 507^2 + 796^2 .

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

It is not a de Polignac number, because 890665 - 2³ = 890657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 890665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416 + ... + 1945.

It is an arithmetic number, because the mean of its divisors is an integer number (136161).

2⁸⁹⁰⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

890665 is a deficient number, since it is larger than the sum of its proper divisors (198623).

890665 is a wasteful number, since it uses less digits than its factorization.

890665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 890665 is about 943.7504966886. The cubic root of 890665 is about 96.2139686350.

The spelling of 890665 in words is "eight hundred ninety thousand, six hundred sixty-five".