39849709 has 2 divisors, whose sum is σ = 39849710. Its totient is φ = 39849708.

The previous prime is 39849701. The next prime is 39849739. The reversal of 39849709 is 90794893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 11526025 = 5322^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 39849709 - 2³ = 39849701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39849701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19924854 + 19924855.

It is an arithmetic number, because the mean of its divisors is an integer number (19924855).

Almost surely, 2^39849709 is an apocalyptic number.

It is an amenable number.

39849709 is a deficient number, since it is larger than the sum of its proper divisors (1).

39849709 is an equidigital number, since it uses as much as digits as its factorization.

39849709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 39849709 is about 6312.6625919655. The cubic root of 39849709 is about 341.5663284449.

The spelling of 39849709 in words is "thirty-nine million, eight hundred forty-nine thousand, seven hundred nine".