16345391 has 4 divisors (see below), whose sum is σ = 16387800. Its totient is φ = 16302984.

The previous prime is 16345369. The next prime is 16345403. The reversal of 16345391 is 19354361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19354361 = 13 ⋅1488797.

It is a cyclic number.

It is not a de Polignac number, because 16345391 - 2⁶ = 16345327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16345321) 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, 20621 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (4096950).

Almost surely, 2^16345391 is an apocalyptic number.

16345391 is a deficient number, since it is larger than the sum of its proper divisors (42409).

16345391 is an equidigital number, since it uses as much as digits as its factorization.

16345391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42408.

The product of its digits is 9720, while the sum is 32.

The square root of 16345391 is about 4042.9433584951. The cubic root of 16345391 is about 253.7845062961.

It can be divided in two parts, 163 and 45391, that added together give a palindrome (45554).

The spelling of 16345391 in words is "sixteen million, three hundred forty-five thousand, three hundred ninety-one".