864399 has 12 divisors (see below), whose sum is σ = 1225544. Its totient is φ = 541824.

The previous prime is 864379. The next prime is 864407. The reversal of 864399 is 993468.

864399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 864399 - 2⁹ = 863887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 864399.

It is not an unprimeable number, because it can be changed into a prime (864319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369 + ... + 1365.

2⁸⁶⁴³⁹⁹ is an apocalyptic number.

864399 is a deficient number, since it is larger than the sum of its proper divisors (361145).

864399 is a wasteful number, since it uses less digits than its factorization.

864399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 1017 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 864399 is about 929.7306061435. The cubic root of 864399 is about 95.2587222743.

The spelling of 864399 in words is "eight hundred sixty-four thousand, three hundred ninety-nine".