15979423 has 2 divisors, whose sum is σ = 15979424. Its totient is φ = 15979422.

The previous prime is 15979393. The next prime is 15979429. The reversal of 15979423 is 32497951.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15979423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15979429) 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, 7989711 + 7989712.

It is an arithmetic number, because the mean of its divisors is an integer number (7989712).

Almost surely, 2^15979423 is an apocalyptic number.

15979423 is a deficient number, since it is larger than the sum of its proper divisors (1).

15979423 is an equidigital number, since it uses as much as digits as its factorization.

15979423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 15979423 is about 3997.4270474894. The cubic root of 15979423 is about 251.8761411570.

The spelling of 15979423 in words is "fifteen million, nine hundred seventy-nine thousand, four hundred twenty-three".