3865405790 has 64 divisors (see below), whose sum is σ = 7534356480. Its totient is φ = 1423008000.

The previous prime is 3865405781. The next prime is 3865405793. The reversal of 3865405790 is 975045683.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865405793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2110175 + ... + 2112005.

It is an arithmetic number, because the mean of its divisors is an integer number (117724320).

Almost surely, 2^3865405790 is an apocalyptic number.

3865405790 is a deficient number, since it is larger than the sum of its proper divisors (3668950690).

3865405790 is a wasteful number, since it uses less digits than its factorization.

3865405790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 3865405790 is about 62172.3876813493. The cubic root of 3865405790 is about 1569.3929509714.

The spelling of 3865405790 in words is "three billion, eight hundred sixty-five million, four hundred five thousand, seven hundred ninety".