3909449729 has 2 divisors, whose sum is σ = 3909449730. Its totient is φ = 3909449728.

The previous prime is 3909449683. The next prime is 3909449737. The reversal of 3909449729 is 9279449093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3901876225 + 7573504 = 62465^2 + 2752^2 .

It is a cyclic number.

It is not a de Polignac number, because 3909449729 - 2⁸ = 3909449473 is a prime.

It is not a weakly prime, because it can be changed into another prime (3909449629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1954724864 + 1954724865.

It is an arithmetic number, because the mean of its divisors is an integer number (1954724865).

Almost surely, 2^3909449729 is an apocalyptic number.

It is an amenable number.

3909449729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3909449729 is an equidigital number, since it uses as much as digits as its factorization.

3909449729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 56.

The square root of 3909449729 is about 62525.5925921538. The cubic root of 3909449729 is about 1575.3312116403.

The spelling of 3909449729 in words is "three billion, nine hundred nine million, four hundred forty-nine thousand, seven hundred twenty-nine".