102399439 has 2 divisors, whose sum is σ = 102399440. Its totient is φ = 102399438.

The previous prime is 102399361. The next prime is 102399443. The reversal of 102399439 is 934993201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102399439 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102399499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51199719 + 51199720.

It is an arithmetic number, because the mean of its divisors is an integer number (51199720).

Almost surely, 2^102399439 is an apocalyptic number.

102399439 is a deficient number, since it is larger than the sum of its proper divisors (1).

102399439 is an equidigital number, since it uses as much as digits as its factorization.

102399439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 102399439 is about 10119.2607931607. The cubic root of 102399439 is about 467.8419837511.

The spelling of 102399439 in words is "one hundred two million, three hundred ninety-nine thousand, four hundred thirty-nine".