8390431972 has 12 divisors (see below), whose sum is σ = 15812737276. Its totient is φ = 3872507040.

The previous prime is 8390431967. The next prime is 8390431979. The reversal of 8390431972 is 2791340938.

It can be written as a sum of positive squares in 2 ways, for example, as 2671442596 + 5718989376 = 51686^2 + 75624^2 .

It is not an unprimeable number, because it can be changed into a prime (8390431979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80677179 + ... + 80677282.

Almost surely, 2^8390431972 is an apocalyptic number.

It is an amenable number.

8390431972 is a deficient number, since it is larger than the sum of its proper divisors (7422305304).

8390431972 is a wasteful number, since it uses less digits than its factorization.

8390431972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161354478 (or 161354476 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 8390431972 is about 91599.3011545394. The cubic root of 8390431972 is about 2032.0206022386.

The spelling of 8390431972 in words is "eight billion, three hundred ninety million, four hundred thirty-one thousand, nine hundred seventy-two".