3939701378 has 6 divisors (see below), whose sum is σ = 5909685219. Its totient is φ = 1969806306.

The previous prime is 3939701377. The next prime is 3939701387. The reversal of 3939701378 is 8731079393.

It can be written as a sum of positive squares in only one way, i.e., 1969850689 + 1969850689 = 44383^2 + 44383^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=44383.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3939701377) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 66575 + ... + 110957.

Almost surely, 2^3939701378 is an apocalyptic number.

3939701378 is a deficient number, since it is larger than the sum of its proper divisors (1969983841).

3939701378 is an frugal number, since it uses more digits than its factorization.

3939701378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88768 (or 44385 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 50.

The square root of 3939701378 is about 62767.0405388051. The cubic root of 3939701378 is about 1579.3841238497.

Multiplying 3939701378 by its sum of digits (50), we get a square (196985068900 = 443830²).

The spelling of 3939701378 in words is "three billion, nine hundred thirty-nine million, seven hundred one thousand, three hundred seventy-eight".