15972417 has 16 divisors (see below), whose sum is σ = 24480000. Its totient is φ = 10280592.

The previous prime is 15972391. The next prime is 15972449. The reversal of 15972417 is 71427951.

It is a happy number.

15972417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15972417 - 2¹¹ = 15970369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15972497) 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, 9417 + ... + 10982.

It is an arithmetic number, because the mean of its divisors is an integer number (1530000).

Almost surely, 2^15972417 is an apocalyptic number.

It is an amenable number.

15972417 is a deficient number, since it is larger than the sum of its proper divisors (8507583).

15972417 is a wasteful number, since it uses less digits than its factorization.

15972417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20437 (or 20431 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 15972417 is about 3996.5506377375. The cubic root of 15972417 is about 251.8393250132.

The spelling of 15972417 in words is "fifteen million, nine hundred seventy-two thousand, four hundred seventeen".