3939802729 has 2 divisors, whose sum is σ = 3939802730. Its totient is φ = 3939802728.

The previous prime is 3939802681. The next prime is 3939802739. The reversal of 3939802729 is 9272089393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3763577104 + 176225625 = 61348^2 + 13275^2 .

It is a cyclic number.

It is not a de Polignac number, because 3939802729 - 2¹⁷ = 3939671657 is a prime.

It is not a weakly prime, because it can be changed into another prime (3939802739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969901364 + 1969901365.

It is an arithmetic number, because the mean of its divisors is an integer number (1969901365).

Almost surely, 2^3939802729 is an apocalyptic number.

It is an amenable number.

3939802729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939802729 is an equidigital number, since it uses as much as digits as its factorization.

3939802729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 3939802729 is about 62767.8478920538. The cubic root of 3939802729 is about 1579.3976672440.

The spelling of 3939802729 in words is "three billion, nine hundred thirty-nine million, eight hundred two thousand, seven hundred twenty-nine".