12442138 has 16 divisors (see below), whose sum is σ = 19261440. Its totient is φ = 6023376.

The previous prime is 12442117. The next prime is 12442139. The reversal of 12442138 is 83124421.

It is a super-2 number, since 2×12442138² = 309613596022088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12442139) 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, 28123 + ... + 28561.

It is an arithmetic number, because the mean of its divisors is an integer number (1203840).

Almost surely, 2^12442138 is an apocalyptic number.

12442138 is a deficient number, since it is larger than the sum of its proper divisors (6819302).

12442138 is a wasteful number, since it uses less digits than its factorization.

12442138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861.

The product of its digits is 1536, while the sum is 25.

The square root of 12442138 is about 3527.3414918321. The cubic root of 12442138 is about 231.7207922346.

Adding to 12442138 its reverse (83124421), we get a palindrome (95566559).

The spelling of 12442138 in words is "twelve million, four hundred forty-two thousand, one hundred thirty-eight".