12444781 has 8 divisors (see below), whose sum is σ = 12778560. Its totient is φ = 12115488.

The previous prime is 12444767. The next prime is 12444787. The reversal of 12444781 is 18744421.

It is a happy number.

12444781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12444781 - 2⁵ = 12444749 is a prime.

It is a super-2 number, since 2×12444781² = 309745148275922, 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 (12444787) 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, 4920 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (1597320).

Almost surely, 2^12444781 is an apocalyptic number.

It is an amenable number.

12444781 is a deficient number, since it is larger than the sum of its proper divisors (333779).

12444781 is an equidigital number, since it uses as much as digits as its factorization.

12444781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243.

The product of its digits is 7168, while the sum is 31.

The square root of 12444781 is about 3527.7161166965. The cubic root of 12444781 is about 231.7371987047.

It can be divided in two parts, 12444 and 781, that added together give a square (13225 = 115²).

The spelling of 12444781 in words is "twelve million, four hundred forty-four thousand, seven hundred eighty-one".