12255778 has 4 divisors (see below), whose sum is σ = 18383670. Its totient is φ = 6127888.

The previous prime is 12255743. The next prime is 12255781. The reversal of 12255778 is 87755221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87755221 = 97 ⋅904693.

It can be written as a sum of positive squares in only one way, i.e., 10259209 + 1996569 = 3203^2 + 1413^2 .

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3063943 + ... + 3063946.

Almost surely, 2^12255778 is an apocalyptic number.

12255778 is a deficient number, since it is larger than the sum of its proper divisors (6127892).

12255778 is an equidigital number, since it uses as much as digits as its factorization.

12255778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6127891.

The product of its digits is 39200, while the sum is 37.

The square root of 12255778 is about 3500.8253312612. The cubic root of 12255778 is about 230.5580525807.

The spelling of 12255778 in words is "twelve million, two hundred fifty-five thousand, seven hundred seventy-eight".