655865 has 12 divisors (see below), whose sum is σ = 915876. Its totient is φ = 449568.

The previous prime is 655859. The next prime is 655883. The reversal of 655865 is 568556.

It can be written as a sum of positive squares in 2 ways, for example, as 94864 + 561001 = 308^2 + 749^2 .

It is not a de Polignac number, because 655865 - 2⁴ = 655849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1094 + ... + 1583.

It is an arithmetic number, because the mean of its divisors is an integer number (76323).

2⁶⁵⁵⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

655865 is a deficient number, since it is larger than the sum of its proper divisors (260011).

655865 is a wasteful number, since it uses less digits than its factorization.

655865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2696 (or 2689 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 655865 is about 809.8549252798. The cubic root of 655865 is about 86.8836688898.

The spelling of 655865 in words is "six hundred fifty-five thousand, eight hundred sixty-five".