12111838 has 4 divisors (see below), whose sum is σ = 18167760. Its totient is φ = 6055918.

The previous prime is 12111833. The next prime is 12111857. The reversal of 12111838 is 83811121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83811121 = 167 ⋅501863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3027958 + ... + 3027961.

It is an arithmetic number, because the mean of its divisors is an integer number (4541940).

Almost surely, 2^12111838 is an apocalyptic number.

12111838 is a deficient number, since it is larger than the sum of its proper divisors (6055922).

12111838 is an equidigital number, since it uses as much as digits as its factorization.

12111838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055921.

The product of its digits is 384, while the sum is 25.

The square root of 12111838 is about 3480.2066030625. The cubic root of 12111838 is about 229.6518867424.

Adding to 12111838 its reverse (83811121), we get a palindrome (95922959).

The spelling of 12111838 in words is "twelve million, one hundred eleven thousand, eight hundred thirty-eight".