23138236 has 12 divisors (see below), whose sum is σ = 44173080. Its totient is φ = 10517360.

The previous prime is 23138197. The next prime is 23138237. The reversal of 23138236 is 63283132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23138237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262891 + ... + 262978.

It is an arithmetic number, because the mean of its divisors is an integer number (3681090).

Almost surely, 2^23138236 is an apocalyptic number.

It is an amenable number.

23138236 is a deficient number, since it is larger than the sum of its proper divisors (21034844).

23138236 is a wasteful number, since it uses less digits than its factorization.

23138236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525884 (or 525882 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 23138236 is about 4810.2220322975. Note that the first 3 decimals coincide. The cubic root of 23138236 is about 284.9553064213.

Subtracting 23138236 from its reverse (63283132), we obtain a square (40144896 = 6336²).

The spelling of 23138236 in words is "twenty-three million, one hundred thirty-eight thousand, two hundred thirty-six".