16845391 has 4 divisors (see below), whose sum is σ = 16857792. Its totient is φ = 16832992.

The previous prime is 16845373. The next prime is 16845403. The reversal of 16845391 is 19354861.

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

It is a cyclic number.

It is not a de Polignac number, because 16845391 - 2¹⁵ = 16812623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16845391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16845371) 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, 3871 + ... + 6976.

It is an arithmetic number, because the mean of its divisors is an integer number (4214448).

Almost surely, 2^16845391 is an apocalyptic number.

16845391 is a deficient number, since it is larger than the sum of its proper divisors (12401).

16845391 is a wasteful number, since it uses less digits than its factorization.

16845391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12400.

The product of its digits is 25920, while the sum is 37.

The square root of 16845391 is about 4104.3137063339. The cubic root of 16845391 is about 256.3462873525.

The spelling of 16845391 in words is "sixteen million, eight hundred forty-five thousand, three hundred ninety-one".