8639407940 has 24 divisors (see below), whose sum is σ = 18157335000. Its totient is φ = 3452986368.

The previous prime is 8639407919. The next prime is 8639407943. The reversal of 8639407940 is 497049368.

It can be written as a sum of positive squares in 4 ways, for example, as 162154756 + 8477253184 = 12734^2 + 92072^2 .

It is not an unprimeable number, because it can be changed into a prime (8639407943) 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, 147947 + ... + 197906.

It is an arithmetic number, because the mean of its divisors is an integer number (756555625).

Almost surely, 2^8639407940 is an apocalyptic number.

It is an amenable number.

8639407940 is an abundant number, since it is smaller than the sum of its proper divisors (9517927060).

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

8639407940 is a wasteful number, since it uses less digits than its factorization.

8639407940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347111 (or 347109 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 8639407940 is about 92948.4154786944. The cubic root of 8639407940 is about 2051.9242641840.

The spelling of 8639407940 in words is "eight billion, six hundred thirty-nine million, four hundred seven thousand, nine hundred forty".