99439709 has 2 divisors, whose sum is σ = 99439710. Its totient is φ = 99439708.

The previous prime is 99439667. The next prime is 99439729. The reversal of 99439709 is 90793499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99400900 + 38809 = 9970^2 + 197^2 .

It is an emirp because it is prime and its reverse (90793499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99439709 - 2²⁴ = 82662493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99439729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49719854 + 49719855.

It is an arithmetic number, because the mean of its divisors is an integer number (49719855).

Almost surely, 2^99439709 is an apocalyptic number.

It is an amenable number.

99439709 is a deficient number, since it is larger than the sum of its proper divisors (1).

99439709 is an equidigital number, since it uses as much as digits as its factorization.

99439709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 99439709 is about 9971.9460989317. The cubic root of 99439709 is about 463.2903791359.

The spelling of 99439709 in words is "ninety-nine million, four hundred thirty-nine thousand, seven hundred nine".