864846921 has 32 divisors (see below), whose sum is σ = 1237143040. Its totient is φ = 535797504.

The previous prime is 864846919. The next prime is 864846947. The reversal of 864846921 is 129648468.

It is not a de Polignac number, because 864846921 - 2¹ = 864846919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864846901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1653366 + ... + 1653888.

It is an arithmetic number, because the mean of its divisors is an integer number (38660720).

Almost surely, 2^864846921 is an apocalyptic number.

It is an amenable number.

864846921 is a deficient number, since it is larger than the sum of its proper divisors (372296119).

864846921 is a wasteful number, since it uses less digits than its factorization.

864846921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045.

The product of its digits is 663552, while the sum is 48.

The square root of 864846921 is about 29408.2798034839. The cubic root of 864846921 is about 952.7517340164.

The spelling of 864846921 in words is "eight hundred sixty-four million, eight hundred forty-six thousand, nine hundred twenty-one".