865977 has 24 divisors (see below), whose sum is σ = 1384416. Its totient is φ = 479808.

The previous prime is 865957. The next prime is 865979. The reversal of 865977 is 779568.

It is not a de Polignac number, because 865977 - 2⁸ = 865721 is a prime.

865977 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 865977.

It is not an unprimeable number, because it can be changed into a prime (865979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6253 + ... + 6389.

It is an arithmetic number, because the mean of its divisors is an integer number (57684).

2⁸⁶⁵⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

865977 is a deficient number, since it is larger than the sum of its proper divisors (518439).

865977 is a wasteful number, since it uses less digits than its factorization.

865977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 190 counting only the distinct ones).

The product of its digits is 105840, while the sum is 42.

The square root of 865977 is about 930.5788521130. The cubic root of 865977 is about 95.3166534247.

The spelling of 865977 in words is "eight hundred sixty-five thousand, nine hundred seventy-seven".