864605 has 12 divisors (see below), whose sum is σ = 1207260. Its totient is φ = 592704.

The previous prime is 864587. The next prime is 864613. The reversal of 864605 is 506468.

It can be written as a sum of positive squares in 2 ways, for example, as 182329 + 682276 = 427^2 + 826^2 .

It is not a de Polignac number, because 864605 - 2⁶ = 864541 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1520 + ... + 2009.

It is an arithmetic number, because the mean of its divisors is an integer number (100605).

2⁸⁶⁴⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

864605 is a deficient number, since it is larger than the sum of its proper divisors (342655).

864605 is a wasteful number, since it uses less digits than its factorization.

864605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548 (or 3541 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 864605 is about 929.8413843232. The cubic root of 864605 is about 95.2662888950.

The spelling of 864605 in words is "eight hundred sixty-four thousand, six hundred five".