23408509 has 4 divisors (see below), whose sum is σ = 23419360. Its totient is φ = 23397660.

The previous prime is 23408479. The next prime is 23408519. The reversal of 23408509 is 90580432.

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 23408509 - 2⁷ = 23408381 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 (23408519) 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, 969 + ... + 6910.

It is an arithmetic number, because the mean of its divisors is an integer number (5854840).

Almost surely, 2^23408509 is an apocalyptic number.

It is an amenable number.

23408509 is a deficient number, since it is larger than the sum of its proper divisors (10851).

23408509 is an equidigital number, since it uses as much as digits as its factorization.

23408509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10850.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 23408509 is about 4838.2340786696. The cubic root of 23408509 is about 286.0605158265.

The spelling of 23408509 in words is "twenty-three million, four hundred eight thousand, five hundred nine".