15997205 has 16 divisors (see below), whose sum is σ = 22063104. Its totient is φ = 10907520.

The previous prime is 15997193. The next prime is 15997207. The reversal of 15997205 is 50279951.

It is a de Polignac number, because none of the positive numbers 2^k-15997205 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5489 + ... + 7881.

It is an arithmetic number, because the mean of its divisors is an integer number (1378944).

Almost surely, 2^15997205 is an apocalyptic number.

It is an amenable number.

15997205 is a deficient number, since it is larger than the sum of its proper divisors (6065899).

15997205 is a wasteful number, since it uses less digits than its factorization.

15997205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 15997205 is about 3999.6506097408. The cubic root of 15997205 is about 251.9695362939.

The spelling of 15997205 in words is "fifteen million, nine hundred ninety-seven thousand, two hundred five".