12247778 has 4 divisors (see below), whose sum is σ = 18371670. Its totient is φ = 6123888.

The previous prime is 12247771. The next prime is 12247783. The reversal of 12247778 is 87774221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87774221 = 67 ⋅1310063.

It can be written as a sum of positive squares in only one way, i.e., 12229009 + 18769 = 3497^2 + 137^2 .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (12247771) 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 as a sum of consecutive naturals, namely, 3061943 + ... + 3061946.

Almost surely, 2^12247778 is an apocalyptic number.

12247778 is a deficient number, since it is larger than the sum of its proper divisors (6123892).

12247778 is an equidigital number, since it uses as much as digits as its factorization.

12247778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6123891.

The product of its digits is 43904, while the sum is 38.

The square root of 12247778 is about 3499.6825570329. The cubic root of 12247778 is about 230.5078758153.

The spelling of 12247778 in words is "twelve million, two hundred forty-seven thousand, seven hundred seventy-eight".