16391872 has 42 divisors (see below), whose sum is σ = 37845492. Its totient is φ = 7023744.

The previous prime is 16391863. The next prime is 16391887. The reversal of 16391872 is 27819361.

16391872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 523 + ... + 5749.

Almost surely, 2^16391872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16391872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18922746).

16391872 is an abundant number, since it is smaller than the sum of its proper divisors (21453620).

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

16391872 is an equidigital number, since it uses as much as digits as its factorization.

16391872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253 (or 5236 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 16391872 is about 4048.6876886221. The cubic root of 16391872 is about 254.0248389539.

The spelling of 16391872 in words is "sixteen million, three hundred ninety-one thousand, eight hundred seventy-two".