16809438 has 8 divisors (see below), whose sum is σ = 33618888. Its totient is φ = 5603144.

The previous prime is 16809437. The next prime is 16809439. The reversal of 16809438 is 83490861.

It is an interprime number because it is at equal distance from previous prime (16809437) and next prime (16809439).

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

16809438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 16809396 and 16809405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16809437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400781 + ... + 1400792.

It is an arithmetic number, because the mean of its divisors is an integer number (4202361).

Almost surely, 2^16809438 is an apocalyptic number.

16809438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16809438 is a wasteful number, since it uses less digits than its factorization.

16809438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801578.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 16809438 is about 4099.9314628418. The cubic root of 16809438 is about 256.1637847578.

The spelling of 16809438 in words is "sixteen million, eight hundred nine thousand, four hundred thirty-eight".