23181604 has 12 divisors (see below), whose sum is σ = 40811904. Its totient is φ = 11521064.

The previous prime is 23181589. The next prime is 23181619. The reversal of 23181604 is 40618132.

It is an interprime number because it is at equal distance from previous prime (23181589) and next prime (23181619).

It is an unprimeable number.

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, 16684 + ... + 18019.

It is an arithmetic number, because the mean of its divisors is an integer number (3400992).

Almost surely, 2^23181604 is an apocalyptic number.

It is an amenable number.

23181604 is a deficient number, since it is larger than the sum of its proper divisors (17630300).

23181604 is a wasteful number, since it uses less digits than its factorization.

23181604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34874 (or 34872 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 23181604 is about 4814.7278220061. The cubic root of 23181604 is about 285.1332259038.

Adding to 23181604 its reverse (40618132), we get a palindrome (63799736).

The spelling of 23181604 in words is "twenty-three million, one hundred eighty-one thousand, six hundred four".