864669 has 8 divisors (see below), whose sum is σ = 1241632. Its totient is φ = 532080.

The previous prime is 864641. The next prime is 864673. The reversal of 864669 is 966468.

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

It is not a de Polignac number, because 864669 - 2⁷ = 864541 is a prime.

It is a super-2 number, since 2×864669² = 1495304959122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 22171 = 864669 / (8 + 6 + 4 + 6 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864629) 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 7 ways as a sum of consecutive naturals, for example, 11047 + ... + 11124.

It is an arithmetic number, because the mean of its divisors is an integer number (155204).

2⁸⁶⁴⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

864669 is a deficient number, since it is larger than the sum of its proper divisors (376963).

864669 is a wasteful number, since it uses less digits than its factorization.

864669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22187.

The product of its digits is 62208, while the sum is 39.

The square root of 864669 is about 929.8757981580. The cubic root of 864669 is about 95.2686394451.

The spelling of 864669 in words is "eight hundred sixty-four thousand, six hundred sixty-nine".