16809413 has 4 divisors (see below), whose sum is σ = 17798220. Its totient is φ = 15820608.

The previous prime is 16809407. The next prime is 16809437. The reversal of 16809413 is 31490861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31490861 = 1489 ⋅21149.

It can be written as a sum of positive squares in 2 ways, for example, as 14303524 + 2505889 = 3782^2 + 1583^2 .

It is not a de Polignac number, because 16809413 - 2⁶ = 16809349 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 16809413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16809613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494378 + ... + 494411.

It is an arithmetic number, because the mean of its divisors is an integer number (4449555).

Almost surely, 2^16809413 is an apocalyptic number.

It is an amenable number.

16809413 is a deficient number, since it is larger than the sum of its proper divisors (988807).

16809413 is an equidigital number, since it uses as much as digits as its factorization.

16809413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988806.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 16809413 is about 4099.9284140092. The cubic root of 16809413 is about 256.1636577637.

The spelling of 16809413 in words is "sixteen million, eight hundred nine thousand, four hundred thirteen".