3856391340 has 24 divisors (see below), whose sum is σ = 10797895920. Its totient is φ = 1028371008.

The previous prime is 3856391327. The next prime is 3856391369. The reversal of 3856391340 is 431936583.

It is a junction number, because it is equal to n+sod(n) for n = 3856391292 and 3856391301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32136535 + ... + 32136654.

It is an arithmetic number, because the mean of its divisors is an integer number (449912330).

Almost surely, 2^3856391340 is an apocalyptic number.

3856391340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3856391340 is an abundant number, since it is smaller than the sum of its proper divisors (6941504580).

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

3856391340 is a wasteful number, since it uses less digits than its factorization.

3856391340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64273201 (or 64273199 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 3856391340 is about 62099.8497582724. The cubic root of 3856391340 is about 1568.1720161095.

The spelling of 3856391340 in words is "three billion, eight hundred fifty-six million, three hundred ninety-one thousand, three hundred forty".