23193809 has 4 divisors (see below), whose sum is σ = 23224740. Its totient is φ = 23162880.

The previous prime is 23193799. The next prime is 23193811. The reversal of 23193809 is 90839132.

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 14025025 + 9168784 = 3745^2 + 3028^2 .

It is a cyclic number.

It is not a de Polignac number, because 23193809 - 2⁸ = 23193553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23193839) 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, 14312 + ... + 15849.

It is an arithmetic number, because the mean of its divisors is an integer number (5806185).

Almost surely, 2^23193809 is an apocalyptic number.

It is an amenable number.

23193809 is a deficient number, since it is larger than the sum of its proper divisors (30931).

23193809 is an equidigital number, since it uses as much as digits as its factorization.

23193809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30930.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 23193809 is about 4815.9951204294. The cubic root of 23193809 is about 285.1832575361.

The spelling of 23193809 in words is "twenty-three million, one hundred ninety-three thousand, eight hundred nine".