15942987 has 12 divisors (see below), whose sum is σ = 23882040. Its totient is φ = 10628496.

The previous prime is 15942977. The next prime is 15943001. The reversal of 15942987 is 78924951.

It is not a de Polignac number, because 15942987 - 2⁷ = 15942859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15942907) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 32562 + ... + 33047.

It is an arithmetic number, because the mean of its divisors is an integer number (1990170).

Almost surely, 2^15942987 is an apocalyptic number.

15942987 is a deficient number, since it is larger than the sum of its proper divisors (7939053).

15942987 is an frugal number, since it uses more digits than its factorization.

15942987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65624 (or 65612 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 15942987 is about 3992.8670150657. The cubic root of 15942987 is about 251.6845542793.

The spelling of 15942987 in words is "fifteen million, nine hundred forty-two thousand, nine hundred eighty-seven".