15999998 has 16 divisors (see below), whose sum is σ = 27571200. Its totient is φ = 6821496.

The previous prime is 15999989. The next prime is 16000057. The reversal of 15999998 is 89999951.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86 + ... + 5657.

It is an arithmetic number, because the mean of its divisors is an integer number (1723200).

Almost surely, 2^15999998 is an apocalyptic number.

15999998 is a deficient number, since it is larger than the sum of its proper divisors (11571202).

15999998 is a wasteful number, since it uses less digits than its factorization.

15999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951.

The product of its digits is 2361960, while the sum is 59.

The square root of 15999998 is about 3999.9997500000. Note that the first 3 decimals coincide. The cubic root of 15999998 is about 251.9841994796.

The spelling of 15999998 in words is "fifteen million, nine hundred ninety-nine thousand, nine hundred ninety-eight".