816965 has 4 divisors (see below), whose sum is σ = 980364. Its totient is φ = 653568.

The previous prime is 816961. The next prime is 816971. The reversal of 816965 is 569618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134689 + 682276 = 367^2 + 826^2 .

It is a cyclic number.

It is not a de Polignac number, because 816965 - 2² = 816961 is a prime.

It is a super-2 number, since 2×816965² = 1334863622450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816961) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 81692 + ... + 81701.

It is an arithmetic number, because the mean of its divisors is an integer number (245091).

2⁸¹⁶⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

816965 is a deficient number, since it is larger than the sum of its proper divisors (163399).

816965 is a wasteful number, since it uses less digits than its factorization.

816965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163398.

The product of its digits is 12960, while the sum is 35.

The square root of 816965 is about 903.8611619049. The cubic root of 816965 is about 93.4833966343.

The spelling of 816965 in words is "eight hundred sixteen thousand, nine hundred sixty-five".