3930781656 has 32 divisors (see below), whose sum is σ = 9829643760. Its totient is φ = 1309901952.

The previous prime is 3930781651. The next prime is 3930781663. The reversal of 3930781656 is 6561870393.

It is a happy number.

It is a super-2 number, since 2×3930781656² = 30902088854292204672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3930781651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75906 + ... + 116718.

Almost surely, 2^3930781656 is an apocalyptic number.

It is an amenable number.

3930781656 is an abundant number, since it is smaller than the sum of its proper divisors (5898862104).

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

3930781656 is a wasteful number, since it uses less digits than its factorization.

3930781656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44835 (or 44831 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 48.

The square root of 3930781656 is about 62695.9460890415. The cubic root of 3930781656 is about 1578.1912828081.

The spelling of 3930781656 in words is "three billion, nine hundred thirty million, seven hundred eighty-one thousand, six hundred fifty-six".