864380391 has 8 divisors (see below), whose sum is σ = 1317151104. Its totient is φ = 493931640.

The previous prime is 864380389. The next prime is 864380401. The reversal of 864380391 is 193083468.

It is a happy number.

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

It is not a de Polignac number, because 864380391 - 2¹ = 864380389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864380381) 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 7 ways as a sum of consecutive naturals, for example, 20580465 + ... + 20580506.

It is an arithmetic number, because the mean of its divisors is an integer number (164643888).

Almost surely, 2^864380391 is an apocalyptic number.

864380391 is a deficient number, since it is larger than the sum of its proper divisors (452770713).

864380391 is a wasteful number, since it uses less digits than its factorization.

864380391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41160981.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 864380391 is about 29400.3467836691. The cubic root of 864380391 is about 952.5803868474.

The spelling of 864380391 in words is "eight hundred sixty-four million, three hundred eighty thousand, three hundred ninety-one".