23400509 has 4 divisors (see below), whose sum is σ = 25527840. Its totient is φ = 21273180.

The previous prime is 23400493. The next prime is 23400523. The reversal of 23400509 is 90500432.

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 23400509 - 2⁴ = 23400493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23400529) 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, 1063649 + ... + 1063670.

It is an arithmetic number, because the mean of its divisors is an integer number (6381960).

Almost surely, 2^23400509 is an apocalyptic number.

It is an amenable number.

23400509 is a deficient number, since it is larger than the sum of its proper divisors (2127331).

23400509 is a wasteful number, since it uses less digits than its factorization.

23400509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127330.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 23400509 is about 4837.4072600930. The cubic root of 23400509 is about 286.0279244744.

The spelling of 23400509 in words is "twenty-three million, four hundred thousand, five hundred nine".