23199809 has 4 divisors (see below), whose sum is σ = 23765700. Its totient is φ = 22633920.

The previous prime is 23199773. The next prime is 23199829. The reversal of 23199809 is 90899132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4190209 + 19009600 = 2047^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 23199809 - 2¹⁶ = 23134273 is a prime.

It is a super-2 number, since 2×23199809² = 1076462275272962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 565849 = 23199809 / (2 + 3 + 1 + 9 + 9 + 8 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23199829) 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, 282884 + ... + 282965.

It is an arithmetic number, because the mean of its divisors is an integer number (5941425).

Almost surely, 2^23199809 is an apocalyptic number.

It is an amenable number.

23199809 is a deficient number, since it is larger than the sum of its proper divisors (565891).

23199809 is an equidigital number, since it uses as much as digits as its factorization.

23199809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565890.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 23199809 is about 4816.6180043678. The cubic root of 23199809 is about 285.2078467417.

The spelling of 23199809 in words is "twenty-three million, one hundred ninety-nine thousand, eight hundred nine".