12442981 has 4 divisors (see below), whose sum is σ = 12459852. Its totient is φ = 12426112.

The previous prime is 12442979. The next prime is 12442987. The reversal of 12442981 is 18924421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3496900 + 8946081 = 1870^2 + 2991^2 .

It is a cyclic number.

It is not a de Polignac number, because 12442981 - 2¹ = 12442979 is a prime.

It is a super-2 number, since 2×12442981² = 309655552332722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12442987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7276 + ... + 8821.

It is an arithmetic number, because the mean of its divisors is an integer number (3114963).

Almost surely, 2^12442981 is an apocalyptic number.

It is an amenable number.

12442981 is a deficient number, since it is larger than the sum of its proper divisors (16871).

12442981 is an equidigital number, since it uses as much as digits as its factorization.

12442981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16870.

The product of its digits is 4608, while the sum is 31.

The square root of 12442981 is about 3527.4609849012. The cubic root of 12442981 is about 231.7260254246.

It can be divided in two parts, 1244 and 2981, that added together give a square (4225 = 65²).

The spelling of 12442981 in words is "twelve million, four hundred forty-two thousand, nine hundred eighty-one".