12440142 has 96 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 3460320.

The previous prime is 12440137. The next prime is 12440143. The reversal of 12440142 is 24104421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69409 + ... + 69587.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^12440142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12440142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16511040).

12440142 is an abundant number, since it is smaller than the sum of its proper divisors (20581938).

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

12440142 is a wasteful number, since it uses less digits than its factorization.

12440142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 12440142 is about 3527.0585478554. The cubic root of 12440142 is about 231.7084004888.

Adding to 12440142 its reverse (24104421), we get a palindrome (36544563).

The spelling of 12440142 in words is "twelve million, four hundred forty thousand, one hundred forty-two".