864439092 has 144 divisors (see below), whose sum is σ = 2499753984. Its totient is φ = 249480000.

The previous prime is 864439091. The next prime is 864439097. The reversal of 864439092 is 290934468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864439091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 821967 + ... + 823017.

Almost surely, 2^864439092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 864439092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249876992).

864439092 is an abundant number, since it is smaller than the sum of its proper divisors (1635314892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

864439092 is a wasteful number, since it uses less digits than its factorization.

864439092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 864439092 is about 29401.3450712718. The cubic root of 864439092 is about 952.6019499447.

The spelling of 864439092 in words is "eight hundred sixty-four million, four hundred thirty-nine thousand, ninety-two".