15728971 has 4 divisors (see below), whose sum is σ = 15743152. Its totient is φ = 15714792.

The previous prime is 15728939. The next prime is 15729001. The reversal of 15728971 is 17982751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17982751 = 197 ⋅91283.

It is a cyclic number.

It is not a de Polignac number, because 15728971 - 2⁵ = 15728939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15768971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5271 + ... + 7696.

It is an arithmetic number, because the mean of its divisors is an integer number (3935788).

Almost surely, 2^15728971 is an apocalyptic number.

15728971 is a deficient number, since it is larger than the sum of its proper divisors (14181).

15728971 is a wasteful number, since it uses less digits than its factorization.

15728971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14180.

The product of its digits is 35280, while the sum is 40.

The square root of 15728971 is about 3965.9766766838. The cubic root of 15728971 is about 250.5532865925.

The spelling of 15728971 in words is "fifteen million, seven hundred twenty-eight thousand, nine hundred seventy-one".