23181338 has 4 divisors (see below), whose sum is σ = 34772010. Its totient is φ = 11590668.

The previous prime is 23181331. The next prime is 23181341. The reversal of 23181338 is 83318132.

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

It can be written as a sum of positive squares in only one way, i.e., 15155449 + 8025889 = 3893^2 + 2833^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 23181338.

It is not an unprimeable number, because it can be changed into a prime (23181331) 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 as a sum of consecutive naturals, namely, 5795333 + ... + 5795336.

Almost surely, 2^23181338 is an apocalyptic number.

23181338 is a deficient number, since it is larger than the sum of its proper divisors (11590672).

23181338 is a wasteful number, since it uses less digits than its factorization.

23181338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11590671.

The product of its digits is 3456, while the sum is 29.

The square root of 23181338 is about 4814.7001983509. The cubic root of 23181338 is about 285.1321353016.

The spelling of 23181338 in words is "twenty-three million, one hundred eighty-one thousand, three hundred thirty-eight".