15999142 has 16 divisors (see below), whose sum is σ = 25485840. Its totient is φ = 7506688.

The previous prime is 15999127. The next prime is 15999169. The reversal of 15999142 is 24199951.

It is a junction number, because it is equal to n+sod(n) for n = 15999095 and 15999104.

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, 18933 + ... + 19759.

It is an arithmetic number, because the mean of its divisors is an integer number (1592865).

Almost surely, 2^15999142 is an apocalyptic number.

15999142 is a deficient number, since it is larger than the sum of its proper divisors (9486698).

15999142 is a wasteful number, since it uses less digits than its factorization.

15999142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415.

The product of its digits is 29160, while the sum is 40.

The square root of 15999142 is about 3999.8927485621. The cubic root of 15999142 is about 251.9797056807.

The spelling of 15999142 in words is "fifteen million, nine hundred ninety-nine thousand, one hundred forty-two".