16438791 has 4 divisors (see below), whose sum is σ = 21918392. Its totient is φ = 10959192.

The previous prime is 16438789. The next prime is 16438817. The reversal of 16438791 is 19783461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16438791 - 2¹ = 16438789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16438291) 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, 2739796 + ... + 2739801.

It is an arithmetic number, because the mean of its divisors is an integer number (5479598).

Almost surely, 2^16438791 is an apocalyptic number.

16438791 is a deficient number, since it is larger than the sum of its proper divisors (5479601).

16438791 is an equidigital number, since it uses as much as digits as its factorization.

16438791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479600.

The product of its digits is 36288, while the sum is 39.

The square root of 16438791 is about 4054.4778948713. The cubic root of 16438791 is about 254.2669759880.

The spelling of 16438791 in words is "sixteen million, four hundred thirty-eight thousand, seven hundred ninety-one".