39999899 has 2 divisors, whose sum is σ = 39999900. Its totient is φ = 39999898.

The previous prime is 39999863. The next prime is 39999901. The reversal of 39999899 is 99899993.

39999899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39999899 - 2⁸ = 39999643 is a prime.

Together with 39999901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39999859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999949 + 19999950.

It is an arithmetic number, because the mean of its divisors is an integer number (19999950).

Almost surely, 2^39999899 is an apocalyptic number.

39999899 is a deficient number, since it is larger than the sum of its proper divisors (1).

39999899 is an equidigital number, since it uses as much as digits as its factorization.

39999899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12754584, while the sum is 65.

The square root of 39999899 is about 6324.5473355806. The cubic root of 39999899 is about 341.9949014891.

The spelling of 39999899 in words is "thirty-nine million, nine hundred ninety-nine thousand, eight hundred ninety-nine".