3856640439 has 8 divisors (see below), whose sum is σ = 5150745712. Its totient is φ = 2566814400.

The previous prime is 3856640423. The next prime is 3856640461. The reversal of 3856640439 is 9340466583.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3856640439 - 2⁴ = 3856640423 is a prime.

It is a super-2 number, since 2×3856640439² = 29747350951460225442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856640479) 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, 1067704 + ... + 1071309.

It is an arithmetic number, because the mean of its divisors is an integer number (643843214).

Almost surely, 2^3856640439 is an apocalyptic number.

3856640439 is a deficient number, since it is larger than the sum of its proper divisors (1294105273).

3856640439 is a wasteful number, since it uses less digits than its factorization.

3856640439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139617.

The product of its (nonzero) digits is 1866240, while the sum is 48.

The square root of 3856640439 is about 62101.8553587572. The cubic root of 3856640439 is about 1568.2057801163.

The spelling of 3856640439 in words is "three billion, eight hundred fifty-six million, six hundred forty thousand, four hundred thirty-nine".