3940439644 has 24 divisors (see below), whose sum is σ = 7169411088. Its totient is φ = 1893471360.

The previous prime is 3940439623. The next prime is 3940439647. The reversal of 3940439644 is 4469340493.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3940439594 and 3940439603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3940439647) 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, 168319 + ... + 190294.

It is an arithmetic number, because the mean of its divisors is an integer number (298725462).

Almost surely, 2^3940439644 is an apocalyptic number.

It is an amenable number.

3940439644 is a deficient number, since it is larger than the sum of its proper divisors (3228971444).

3940439644 is a wasteful number, since it uses less digits than its factorization.

3940439644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358725 (or 358723 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 46.

The square root of 3940439644 is about 62772.9212638698. The cubic root of 3940439644 is about 1579.4827720011.

The spelling of 3940439644 in words is "three billion, nine hundred forty million, four hundred thirty-nine thousand, six hundred forty-four".