12278089 has 4 divisors (see below), whose sum is σ = 12446356. Its totient is φ = 12109824.

The previous prime is 12278083. The next prime is 12278093. The reversal of 12278089 is 98087221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98087221 = 107 ⋅916703.

It can be written as a sum of positive squares in 2 ways, for example, as 4549689 + 7728400 = 2133^2 + 2780^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12278089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12278083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84024 + ... + 84169.

It is an arithmetic number, because the mean of its divisors is an integer number (3111589).

Almost surely, 2^12278089 is an apocalyptic number.

It is an amenable number.

12278089 is a deficient number, since it is larger than the sum of its proper divisors (168267).

12278089 is an equidigital number, since it uses as much as digits as its factorization.

12278089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168266.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 12278089 is about 3504.0104166512. The cubic root of 12278089 is about 230.6978740433.

It can be divided in two parts, 1227 and 8089, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 12278089 in words is "twelve million, two hundred seventy-eight thousand, eighty-nine".