16397791 has 8 divisors (see below), whose sum is σ = 16991744. Its totient is φ = 15807960.

The previous prime is 16397767. The next prime is 16397803. The reversal of 16397791 is 19779361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16397791 - 2⁹ = 16397279 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 (16397761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8656 + ... + 10378.

It is an arithmetic number, because the mean of its divisors is an integer number (2123968).

Almost surely, 2^16397791 is an apocalyptic number.

16397791 is a deficient number, since it is larger than the sum of its proper divisors (593953).

16397791 is a wasteful number, since it uses less digits than its factorization.

16397791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061.

The product of its digits is 71442, while the sum is 43.

The square root of 16397791 is about 4049.4186002437. The cubic root of 16397791 is about 254.0554108553.

The spelling of 16397791 in words is "sixteen million, three hundred ninety-seven thousand, seven hundred ninety-one".