3999138465 has 16 divisors (see below), whose sum is σ = 7312710528. Its totient is φ = 1828177536.

The previous prime is 3999138457. The next prime is 3999138469. The reversal of 3999138465 is 5648319993.

3999138465 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3999138465 - 2³ = 3999138457 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 19043412 + ... + 19043621.

It is an arithmetic number, because the mean of its divisors is an integer number (457044408).

Almost surely, 2^3999138465 is an apocalyptic number.

3999138465 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3999138465 is a deficient number, since it is larger than the sum of its proper divisors (3313572063).

3999138465 is a wasteful number, since it uses less digits than its factorization.

3999138465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38087048.

The product of its digits is 6298560, while the sum is 57.

The square root of 3999138465 is about 63238.7418043718. The cubic root of 3999138465 is about 1587.2870769879.

The spelling of 3999138465 in words is "three billion, nine hundred ninety-nine million, one hundred thirty-eight thousand, four hundred sixty-five".