15979799 has 4 divisors (see below), whose sum is σ = 17432520. Its totient is φ = 14527080.

The previous prime is 15979793. The next prime is 15979801. The reversal of 15979799 is 99797951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99797951 = 11 ⋅9072541.

It is a cyclic number.

It is not a de Polignac number, because 15979799 - 2¹² = 15975703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15979793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726344 + ... + 726365.

It is an arithmetic number, because the mean of its divisors is an integer number (4358130).

Almost surely, 2^15979799 is an apocalyptic number.

15979799 is a deficient number, since it is larger than the sum of its proper divisors (1452721).

15979799 is a wasteful number, since it uses less digits than its factorization.

15979799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452720.

The product of its digits is 1607445, while the sum is 56.

The square root of 15979799 is about 3997.4740774644. The cubic root of 15979799 is about 251.8781167119.

The spelling of 15979799 in words is "fifteen million, nine hundred seventy-nine thousand, seven hundred ninety-nine".