866957 has 12 divisors (see below), whose sum is σ = 1086876. Its totient is φ = 685440.

The previous prime is 866953. The next prime is 866963. The reversal of 866957 is 759668.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 137641 + 729316 = 371^2 + 854^2 .

It is not a de Polignac number, because 866957 - 2² = 866953 is a prime.

It is a super-2 number, since 2×866957² = 1503228879698, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866957.

It is not an unprimeable number, because it can be changed into a prime (866953) 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 11 ways as a sum of consecutive naturals, for example, 44 + ... + 1317.

It is an arithmetic number, because the mean of its divisors is an integer number (90573).

2⁸⁶⁶⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

866957 is a deficient number, since it is larger than the sum of its proper divisors (219919).

866957 is a wasteful number, since it uses less digits than its factorization.

866957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388 (or 1381 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 866957 is about 931.1052572078. The cubic root of 866957 is about 95.3525955286.

The spelling of 866957 in words is "eight hundred sixty-six thousand, nine hundred fifty-seven".