15979889 has 2 divisors, whose sum is σ = 15979890. Its totient is φ = 15979888.

The previous prime is 15979879. The next prime is 15979891. The reversal of 15979889 is 98897951.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15864289 + 115600 = 3983^2 + 340^2 .

It is an emirp because it is prime and its reverse (98897951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15979889 is a prime.

Together with 15979891, 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 (15979829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7989944 + 7989945.

It is an arithmetic number, because the mean of its divisors is an integer number (7989945).

Almost surely, 2^15979889 is an apocalyptic number.

It is an amenable number.

15979889 is a deficient number, since it is larger than the sum of its proper divisors (1).

15979889 is an equidigital number, since it uses as much as digits as its factorization.

15979889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 56.

The square root of 15979889 is about 3997.4853345572. The cubic root of 15979889 is about 251.8785895795.

The spelling of 15979889 in words is "fifteen million, nine hundred seventy-nine thousand, eight hundred eighty-nine".