23415509 has 16 divisors (see below), whose sum is σ = 26342400. Its totient is φ = 20666880.

The previous prime is 23415493. The next prime is 23415517. The reversal of 23415509 is 90551432.

It is not a de Polignac number, because 23415509 - 2⁴ = 23415493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23412509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38792 + ... + 39390.

It is an arithmetic number, because the mean of its divisors is an integer number (1646400).

Almost surely, 2^23415509 is an apocalyptic number.

It is an amenable number.

23415509 is a deficient number, since it is larger than the sum of its proper divisors (2926891).

23415509 is a wasteful number, since it uses less digits than its factorization.

23415509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 23415509 is about 4838.9574290337. The cubic root of 23415509 is about 286.0890271689.

The spelling of 23415509 in words is "twenty-three million, four hundred fifteen thousand, five hundred nine".