12140242 has 4 divisors (see below), whose sum is σ = 18210366. Its totient is φ = 6070120.

The previous prime is 12140237. The next prime is 12140243. The reversal of 12140242 is 24204121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24204121 = 2521 ⋅9601.

It can be written as a sum of positive squares in only one way, i.e., 11964681 + 175561 = 3459^2 + 419^2 .

It is not an unprimeable number, because it can be changed into a prime (12140243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3035059 + ... + 3035062.

Almost surely, 2^12140242 is an apocalyptic number.

12140242 is a deficient number, since it is larger than the sum of its proper divisors (6070124).

12140242 is an equidigital number, since it uses as much as digits as its factorization.

12140242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070123.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12140242 is about 3484.2850055643. The cubic root of 12140242 is about 229.8312688113.

Adding to 12140242 its reverse (24204121), we get a palindrome (36344363).

The spelling of 12140242 in words is "twelve million, one hundred forty thousand, two hundred forty-two".