3856765840 has 40 divisors (see below), whose sum is σ = 8969658048. Its totient is φ = 1542245760.

The previous prime is 3856765817. The next prime is 3856765841. The reversal of 3856765840 is 485676583.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (3856765841) 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, 419695 + ... + 428785.

Almost surely, 2^3856765840 is an apocalyptic number.

It is an amenable number.

3856765840 is an abundant number, since it is smaller than the sum of its proper divisors (5112892208).

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

3856765840 is a wasteful number, since it uses less digits than its factorization.

3856765840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14407 (or 14401 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 52.

The square root of 3856765840 is about 62102.8649902724. The cubic root of 3856765840 is about 1568.2227769857. Note that the first 3 decimals are identical.

The spelling of 3856765840 in words is "three billion, eight hundred fifty-six million, seven hundred sixty-five thousand, eight hundred forty".