12278743 has 6 divisors (see below), whose sum is σ = 13043816. Its totient is φ = 11556192.

The previous prime is 12278737. The next prime is 12278753. The reversal of 12278743 is 34787221.

It is not a de Polignac number, because 12278743 - 2¹³ = 12270551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12278699 and 12278708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12278753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20955 + ... + 21532.

Almost surely, 2^12278743 is an apocalyptic number.

12278743 is a deficient number, since it is larger than the sum of its proper divisors (765073).

12278743 is an equidigital number, since it uses as much as digits as its factorization.

12278743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42521 (or 42504 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 12278743 is about 3504.1037370489. The cubic root of 12278743 is about 230.7019700589.

The spelling of 12278743 in words is "twelve million, two hundred seventy-eight thousand, seven hundred forty-three".