15997866 has 16 divisors (see below), whose sum is σ = 32174688. Its totient is φ = 5302800.

The previous prime is 15997859. The next prime is 15997871. The reversal of 15997866 is 66879951.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6280 + ... + 8451.

It is an arithmetic number, because the mean of its divisors is an integer number (2010918).

Almost surely, 2^15997866 is an apocalyptic number.

15997866 is an abundant number, since it is smaller than the sum of its proper divisors (16176822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15997866 is a wasteful number, since it uses less digits than its factorization.

15997866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14917.

The product of its digits is 816480, while the sum is 51.

The square root of 15997866 is about 3999.7332411050. The cubic root of 15997866 is about 251.9730066829.

The spelling of 15997866 in words is "fifteen million, nine hundred ninety-seven thousand, eight hundred sixty-six".