899665 has 8 divisors (see below), whose sum is σ = 1162728. Its totient is φ = 664320.

The previous prime is 899659. The next prime is 899671. The reversal of 899665 is 566998.

899665 = T₁₉₅ + T₁₉₆ + ... + T₂₃₃.

It is an interprime number because it is at equal distance from previous prime (899659) and next prime (899671).

It can be written as a sum of positive squares in 4 ways, for example, as 961 + 898704 = 31^2 + 948^2 .

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

It is not a de Polignac number, because 899665 - 2⁷ = 899537 is a prime.

It is a super-2 number, since 2×899665² = 1618794224450, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

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, 6856 + ... + 6985.

It is an arithmetic number, because the mean of its divisors is an integer number (145341).

2⁸⁹⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

899665 is a deficient number, since it is larger than the sum of its proper divisors (263063).

899665 is a wasteful number, since it uses less digits than its factorization.

899665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13859.

The product of its digits is 116640, while the sum is 43.

The square root of 899665 is about 948.5067211148. The cubic root of 899665 is about 96.5369577538.

The spelling of 899665 in words is "eight hundred ninety-nine thousand, six hundred sixty-five".