3939394939394 has 32 divisors (see below), whose sum is σ = 6295033008576. Its totient is φ = 1842499975680.

The previous prime is 3939394939369. The next prime is 3939394939397. The reversal of 3939394939394 is 4939394939393.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3939394939397) 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 15 ways as a sum of consecutive naturals, for example, 3878789 + ... + 4787879.

It is an arithmetic number, because the mean of its divisors is an integer number (196719781518).

Almost surely, 2^{3939394939394} is an apocalyptic number.

3939394939394 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

3939394939394 is a deficient number, since it is larger than the sum of its proper divisors (2355638069182).

3939394939394 is a wasteful number, since it uses less digits than its factorization.

3939394939394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909890.

The product of its digits is 2066242608, while the sum is 77.

Subtracting 3939394939394 from its reverse (4939394939393), we obtain a palindrome (999999999999).

It can be divided in two parts, 3 and 939394939394, that multiplied together give a palindrome (2818184818182).

The spelling of 3939394939394 in words is "three trillion, nine hundred thirty-nine billion, three hundred ninety-four million, nine hundred thirty-nine thousand, three hundred ninety-four".