864279 has 24 divisors (see below), whose sum is σ = 1375920. Its totient is φ = 519552.

The previous prime is 864277. The next prime is 864289. The reversal of 864279 is 972468.

864279 is a `hidden beast` number, since 8 + 642 + 7 + 9 = 666.

It is not a de Polignac number, because 864279 - 2¹ = 864277 is a prime.

It is an Ulam number.

864279 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9667 + ... + 9755.

It is an arithmetic number, because the mean of its divisors is an integer number (57330).

2⁸⁶⁴²⁷⁹ is an apocalyptic number.

864279 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

864279 is a deficient number, since it is larger than the sum of its proper divisors (511641).

864279 is a wasteful number, since it uses less digits than its factorization.

864279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 188 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 864279 is about 929.6660690807. Note that the first 3 decimals coincide. The cubic root of 864279 is about 95.2543139799.

It can be divided in two parts, 86427 and 9, that added together give a square (86436 = 294²).

The spelling of 864279 in words is "eight hundred sixty-four thousand, two hundred seventy-nine".