8391399492 has 24 divisors (see below), whose sum is σ = 22377065536. Its totient is φ = 2397542688.

The previous prime is 8391399491. The next prime is 8391399503. The reversal of 8391399492 is 2949931938.

It is not an unprimeable number, because it can be changed into a prime (8391399491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49948723 + ... + 49948890.

Almost surely, 2^8391399492 is an apocalyptic number.

It is an amenable number.

8391399492 is an abundant number, since it is smaller than the sum of its proper divisors (13985666044).

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

8391399492 is a wasteful number, since it uses less digits than its factorization.

8391399492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99897627 (or 99897625 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 57.

The square root of 8391399492 is about 91604.5822652994. The cubic root of 8391399492 is about 2032.0987048923.

The spelling of 8391399492 in words is "eight billion, three hundred ninety-one million, three hundred ninety-nine thousand, four hundred ninety-two".