11823138 has 16 divisors (see below), whose sum is σ = 26273760. Its totient is φ = 3941028.

The previous prime is 11823113. The next prime is 11823139. The reversal of 11823138 is 83132811.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (11823139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109420 + ... + 109527.

It is an arithmetic number, because the mean of its divisors is an integer number (1642110).

Almost surely, 2^11823138 is an apocalyptic number.

11823138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11823138 is an abundant number, since it is smaller than the sum of its proper divisors (14450622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11823138 is a wasteful number, since it uses less digits than its factorization.

11823138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218958 (or 218952 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 11823138 is about 3438.4790242199. The cubic root of 11823138 is about 227.8125190096.

Adding to 11823138 its reverse (83132811), we get a palindrome (94955949).

The spelling of 11823138 in words is "eleven million, eight hundred twenty-three thousand, one hundred thirty-eight".