3999138464 has 12 divisors (see below), whose sum is σ = 7873303914. Its totient is φ = 1999569216.

The previous prime is 3999138457. The next prime is 3999138469. The reversal of 3999138464 is 4648319993.

It can be written as a sum of positive squares in only one way, i.e., 3611048464 + 388090000 = 60092^2 + 19700^2 .

It is not an unprimeable number, because it can be changed into a prime (3999138469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62486507 + ... + 62486570.

Almost surely, 2^3999138464 is an apocalyptic number.

It is an amenable number.

3999138464 is a deficient number, since it is larger than the sum of its proper divisors (3874165450).

3999138464 is a wasteful number, since it uses less digits than its factorization.

3999138464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124973087 (or 124973079 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 56.

The square root of 3999138464 is about 63238.7417964652. The cubic root of 3999138464 is about 1587.2870768556.

The spelling of 3999138464 in words is "three billion, nine hundred ninety-nine million, one hundred thirty-eight thousand, four hundred sixty-four".