15864216 has 16 divisors (see below), whose sum is σ = 39660600. Its totient is φ = 5288064.

The previous prime is 15864203. The next prime is 15864217. The reversal of 15864216 is 61246851.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15864217) 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, 330481 + ... + 330528.

Almost surely, 2^15864216 is an apocalyptic number.

It is an amenable number.

15864216 is an abundant number, since it is smaller than the sum of its proper divisors (23796384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15864216 is a wasteful number, since it uses less digits than its factorization.

15864216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661018 (or 661014 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 15864216 is about 3982.9908360427. The cubic root of 15864216 is about 251.2693626324.

The spelling of 15864216 in words is "fifteen million, eight hundred sixty-four thousand, two hundred sixteen".