15979879 has 2 divisors, whose sum is σ = 15979880. Its totient is φ = 15979878.

The previous prime is 15979829. The next prime is 15979889. The reversal of 15979879 is 97897951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15979879 - 2⁷ = 15979751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15979829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7989939 + 7989940.

It is an arithmetic number, because the mean of its divisors is an integer number (7989940).

Almost surely, 2^15979879 is an apocalyptic number.

15979879 is a deficient number, since it is larger than the sum of its proper divisors (1).

15979879 is an equidigital number, since it uses as much as digits as its factorization.

15979879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428840, while the sum is 55.

The square root of 15979879 is about 3997.4840837707. The cubic root of 15979879 is about 251.8785370388.

It can be divided in two parts, 1597 and 9879, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 15979879 in words is "fifteen million, nine hundred seventy-nine thousand, eight hundred seventy-nine".