15995939 has 2 divisors, whose sum is σ = 15995940. Its totient is φ = 15995938.

The previous prime is 15995909. The next prime is 15995953. The reversal of 15995939 is 93959951.

It is a strong prime.

It is an emirp because it is prime and its reverse (93959951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15995939 - 2¹⁶ = 15930403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15995909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7997969 + 7997970.

It is an arithmetic number, because the mean of its divisors is an integer number (7997970).

Almost surely, 2^15995939 is an apocalyptic number.

15995939 is a deficient number, since it is larger than the sum of its proper divisors (1).

15995939 is an equidigital number, since it uses as much as digits as its factorization.

15995939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 492075, while the sum is 50.

The square root of 15995939 is about 3999.4923427855. The cubic root of 15995939 is about 251.9628892610.

The spelling of 15995939 in words is "fifteen million, nine hundred ninety-five thousand, nine hundred thirty-nine".