3856393938 has 16 divisors (see below), whose sum is σ = 8118724320. Its totient is φ = 1217808576.

The previous prime is 3856393921. The next prime is 3856393939. The reversal of 3856393938 is 8393936583.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (3856393939) 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, 16913895 + ... + 16914122.

It is an arithmetic number, because the mean of its divisors is an integer number (507420270).

Almost surely, 2^3856393938 is an apocalyptic number.

3856393938 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

3856393938 is an abundant number, since it is smaller than the sum of its proper divisors (4262330382).

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

3856393938 is a wasteful number, since it uses less digits than its factorization.

3856393938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33828041.

The product of its digits is 12597120, while the sum is 57.

The square root of 3856393938 is about 62099.8706761938. The cubic root of 3856393938 is about 1568.1723682617.

The spelling of 3856393938 in words is "three billion, eight hundred fifty-six million, three hundred ninety-three thousand, nine hundred thirty-eight".