3939640369394 has 16 divisors (see below), whose sum is σ = 6222100315680. Its totient is φ = 1865660781600.

The previous prime is 3939640369349. The next prime is 3939640369403. The reversal of 3939640369394 is 4939630469393.

It is a happy number.

3939640369394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 13314419 + ... + 13607094.

It is an arithmetic number, because the mean of its divisors is an integer number (388881269730).

Almost surely, 2^{3939640369394} is an apocalyptic number.

3939640369394 is a deficient number, since it is larger than the sum of its proper divisors (2282459946286).

3939640369394 is a wasteful number, since it uses less digits than its factorization.

3939640369394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26925385.

The product of its (nonzero) digits is 306110016, while the sum is 68.

Subtracting 3939640369394 from its reverse (4939630469393), we obtain a palindrome (999990099999).

It can be divided in two parts, 3939640 and 369394, that added together give a palindrome (4309034).

The spelling of 3939640369394 in words is "three trillion, nine hundred thirty-nine billion, six hundred forty million, three hundred sixty-nine thousand, three hundred ninety-four".