3939704947161 has 45 divisors (see below), whose sum is σ = 6252274831341. Its totient is φ = 2471781184128.

The previous prime is 3939704947151. The next prime is 3939704947187. The reversal of 3939704947161 is 1617494079393.

The square root of 3939704947161 is 1984869.

It is a perfect power (a square), and thus also a powerful number.

3939704947161 is a `hidden beast` number, since 3 + 9 + 3 + 9 + 70 + 494 + 71 + 6 + 1 = 666.

3939704947161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 678285663561 + 3261419283600 = 823581^2 + 1805940^2 .

It is not a de Polignac number, because 3939704947161 - 2¹³ = 3939704938969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3939704947151) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 303678471 + ... + 303691443.

Almost surely, 2^{3939704947161} is an apocalyptic number.

3939704947161 is the 1984869-th square number.

3939704947161 is the 992435-th centered octagonal number.

It is an amenable number.

3939704947161 is a deficient number, since it is larger than the sum of its proper divisors (2312569884180).

3939704947161 is an frugal number, since it uses more digits than its factorization.

3939704947161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25992 (or 12993 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 63.

The spelling of 3939704947161 in words is "three trillion, nine hundred thirty-nine billion, seven hundred four million, nine hundred forty-seven thousand, one hundred sixty-one".