864805 has 8 divisors (see below), whose sum is σ = 1043352. Its totient is φ = 688128.

The previous prime is 864803. The next prime is 864811. The reversal of 864805 is 508468.

It can be written as a sum of positive squares in 4 ways, for example, as 247009 + 617796 = 497^2 + 786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 864805 - 2¹ = 864803 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 (864803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (130419).

2⁸⁶⁴⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

864805 is a deficient number, since it is larger than the sum of its proper divisors (178547).

864805 is a wasteful number, since it uses less digits than its factorization.

864805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 864805 is about 929.9489233286. The cubic root of 864805 is about 95.2736339789.

The spelling of 864805 in words is "eight hundred sixty-four thousand, eight hundred five".