12278641 has 4 divisors (see below), whose sum is σ = 13000932. Its totient is φ = 11556352.

The previous prime is 12278633. The next prime is 12278647. The reversal of 12278641 is 14687221.

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 9486400 + 2792241 = 3080^2 + 1671^2 .

It is a cyclic number.

It is not a de Polignac number, because 12278641 - 2³ = 12278633 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12278647) 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, 361120 + ... + 361153.

It is an arithmetic number, because the mean of its divisors is an integer number (3250233).

Almost surely, 2^12278641 is an apocalyptic number.

It is an amenable number.

12278641 is a deficient number, since it is larger than the sum of its proper divisors (722291).

12278641 is an equidigital number, since it uses as much as digits as its factorization.

12278641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722290.

The product of its digits is 5376, while the sum is 31.

The square root of 12278641 is about 3504.0891826550. The cubic root of 12278641 is about 230.7013312403.

The spelling of 12278641 in words is "twelve million, two hundred seventy-eight thousand, six hundred forty-one".