23813138 has 4 divisors (see below), whose sum is σ = 35719710. Its totient is φ = 11906568.

The previous prime is 23813131. The next prime is 23813143. The reversal of 23813138 is 83131832.

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., 19598329 + 4214809 = 4427^2 + 2053^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 23813138.

It is not an unprimeable number, because it can be changed into a prime (23813131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5953283 + ... + 5953286.

Almost surely, 2^23813138 is an apocalyptic number.

23813138 is a deficient number, since it is larger than the sum of its proper divisors (11906572).

23813138 is a wasteful number, since it uses less digits than its factorization.

23813138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11906571.

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

The square root of 23813138 is about 4879.8706950082. The cubic root of 23813138 is about 287.6993470628.

The spelling of 23813138 in words is "twenty-three million, eight hundred thirteen thousand, one hundred thirty-eight".