864877 has 4 divisors (see below), whose sum is σ = 931420. Its totient is φ = 798336.

The previous prime is 864817. The next prime is 864883. The reversal of 864877 is 778468.

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 417316 + 447561 = 646^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 864877 - 2¹⁵ = 832109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864817) 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, 33252 + ... + 33277.

It is an arithmetic number, because the mean of its divisors is an integer number (232855).

2⁸⁶⁴⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

864877 is a deficient number, since it is larger than the sum of its proper divisors (66543).

864877 is a wasteful number, since it uses less digits than its factorization.

864877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66542.

The product of its digits is 75264, while the sum is 40.

The square root of 864877 is about 929.9876343264. The cubic root of 864877 is about 95.2762779319.

The spelling of 864877 in words is "eight hundred sixty-four thousand, eight hundred seventy-seven".