864721395 has 24 divisors (see below), whose sum is σ = 1509801696. Its totient is φ = 457815168.

The previous prime is 864721379. The next prime is 864721399. The reversal of 864721395 is 593127468.

864721395 is a `hidden beast` number, since 86 + 472 + 13 + 95 = 666.

It is not a de Polignac number, because 864721395 - 2⁴ = 864721379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 864721395.

It is not an unprimeable number, because it can be changed into a prime (864721399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63967 + ... + 76296.

It is an arithmetic number, because the mean of its divisors is an integer number (62908404).

Almost surely, 2^864721395 is an apocalyptic number.

864721395 is a deficient number, since it is larger than the sum of its proper divisors (645080301).

864721395 is a wasteful number, since it uses less digits than its factorization.

864721395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140411 (or 140408 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 864721395 is about 29406.1455311641. The cubic root of 864721395 is about 952.7056368795.

The spelling of 864721395 in words is "eight hundred sixty-four million, seven hundred twenty-one thousand, three hundred ninety-five".