15972985 has 16 divisors (see below), whose sum is σ = 22442112. Its totient is φ = 10684800.

The previous prime is 15972959. The next prime is 15972989. The reversal of 15972985 is 58927951.

It is not a de Polignac number, because 15972985 - 2⁵ = 15972953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15972989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4131 + ... + 7000.

It is an arithmetic number, because the mean of its divisors is an integer number (1402632).

Almost surely, 2^15972985 is an apocalyptic number.

It is an amenable number.

15972985 is a deficient number, since it is larger than the sum of its proper divisors (6469127).

15972985 is a wasteful number, since it uses less digits than its factorization.

15972985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11184.

The product of its digits is 226800, while the sum is 46.

The square root of 15972985 is about 3996.6216983848. The cubic root of 15972985 is about 251.8423102228.

The spelling of 15972985 in words is "fifteen million, nine hundred seventy-two thousand, nine hundred eighty-five".