12081442 has 4 divisors (see below), whose sum is σ = 18122166. Its totient is φ = 6040720.

The previous prime is 12081439. The next prime is 12081449. The reversal of 12081442 is 24418021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24418021 = 19 ⋅1285159.

It can be written as a sum of positive squares in only one way, i.e., 9492561 + 2588881 = 3081^2 + 1609^2 .

It is a super-2 number, since 2×12081442² = 291922481598728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12081449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3020359 + ... + 3020362.

Almost surely, 2^12081442 is an apocalyptic number.

12081442 is a deficient number, since it is larger than the sum of its proper divisors (6040724).

12081442 is an equidigital number, since it uses as much as digits as its factorization.

12081442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040723.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 12081442 is about 3475.8368776454. The cubic root of 12081442 is about 229.4596135204.

Adding to 12081442 its reverse (24418021), we get a palindrome (36499463).

The spelling of 12081442 in words is "twelve million, eighty-one thousand, four hundred forty-two".