16823009 has 4 divisors (see below), whose sum is σ = 19226304. Its totient is φ = 14419716.

The previous prime is 16822969. The next prime is 16823011. The reversal of 16823009 is 90032861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16823009 - 2¹⁶ = 16757473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16823809) 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, 1201637 + ... + 1201650.

It is an arithmetic number, because the mean of its divisors is an integer number (4806576).

Almost surely, 2^16823009 is an apocalyptic number.

It is an amenable number.

16823009 is a deficient number, since it is larger than the sum of its proper divisors (2403295).

16823009 is an equidigital number, since it uses as much as digits as its factorization.

16823009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403294.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16823009 is about 4101.5861565984. The cubic root of 16823009 is about 256.2327036511.

The spelling of 16823009 in words is "sixteen million, eight hundred twenty-three thousand, nine".