3939449009 has 2 divisors, whose sum is σ = 3939449010. Its totient is φ = 3939449008.

The previous prime is 3939448967. The next prime is 3939449021. The reversal of 3939449009 is 9009449393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3887896609 + 51552400 = 62353^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 3939449009 - 2⁸ = 3939448753 is a prime.

It is a super-2 number, since 2×3939449009² = 31038516989022164162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3939449509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969724504 + 1969724505.

It is an arithmetic number, because the mean of its divisors is an integer number (1969724505).

Almost surely, 2^3939449009 is an apocalyptic number.

It is an amenable number.

3939449009 is a deficient number, since it is larger than the sum of its proper divisors (1).

3939449009 is an equidigital number, since it uses as much as digits as its factorization.

3939449009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 50.

The square root of 3939449009 is about 62765.0301441814. The cubic root of 3939449009 is about 1579.3503991191.

The spelling of 3939449009 in words is "three billion, nine hundred thirty-nine million, four hundred forty-nine thousand, nine".