15990099 has 4 divisors (see below), whose sum is σ = 21320136. Its totient is φ = 10660064.

The previous prime is 15990097. The next prime is 15990119. The reversal of 15990099 is 99009951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15990099 - 2¹ = 15990097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15990099.

It is not an unprimeable number, because it can be changed into a prime (15990097) 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 in 3 ways as a sum of consecutive naturals, for example, 2665014 + ... + 2665019.

It is an arithmetic number, because the mean of its divisors is an integer number (5330034).

Almost surely, 2^15990099 is an apocalyptic number.

15990099 is a deficient number, since it is larger than the sum of its proper divisors (5330037).

15990099 is an equidigital number, since it uses as much as digits as its factorization.

15990099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330036.

The product of its (nonzero) digits is 32805, while the sum is 42.

The square root of 15990099 is about 3998.7621834763. The cubic root of 15990099 is about 251.9322222610.

The spelling of 15990099 in words is "fifteen million, nine hundred ninety thousand, ninety-nine".