23400809 has 4 divisors (see below), whose sum is σ = 23410560. Its totient is φ = 23391060.

The previous prime is 23400803. The next prime is 23400829. The reversal of 23400809 is 90800432.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23400809 - 2¹² = 23396713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23400803) 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, 1532 + ... + 7010.

It is an arithmetic number, because the mean of its divisors is an integer number (5852640).

Almost surely, 2^23400809 is an apocalyptic number.

It is an amenable number.

23400809 is a deficient number, since it is larger than the sum of its proper divisors (9751).

23400809 is an equidigital number, since it uses as much as digits as its factorization.

23400809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9750.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 23400809 is about 4837.4382683400. The cubic root of 23400809 is about 286.0291467842.

The spelling of 23400809 in words is "twenty-three million, four hundred thousand, eight hundred nine".