23509443 has 4 divisors (see below), whose sum is σ = 31345928. Its totient is φ = 15672960.

The previous prime is 23509411. The next prime is 23509469. The reversal of 23509443 is 34490532.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 23509443 - 2⁵ = 23509411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23509443.

It is not an unprimeable number, because it can be changed into a prime (23509043) 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, 3918238 + ... + 3918243.

It is an arithmetic number, because the mean of its divisors is an integer number (7836482).

Almost surely, 2^23509443 is an apocalyptic number.

23509443 is a deficient number, since it is larger than the sum of its proper divisors (7836485).

23509443 is an equidigital number, since it uses as much as digits as its factorization.

23509443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7836484.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 23509443 is about 4848.6537306762. The cubic root of 23509443 is about 286.4710763939.

Adding to 23509443 its reverse (34490532), we get a palindrome (57999975).

The spelling of 23509443 in words is "twenty-three million, five hundred nine thousand, four hundred forty-three".