12249778 has 4 divisors (see below), whose sum is σ = 18374670. Its totient is φ = 6124888.

The previous prime is 12249773. The next prime is 12249779. The reversal of 12249778 is 87794221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9162729 + 3087049 = 3027^2 + 1757^2 .

It is a super-2 number, since 2×12249778² = 300114122098568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 12249778.

It is not an unprimeable number, because it can be changed into a prime (12249773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3062443 + ... + 3062446.

Almost surely, 2^12249778 is an apocalyptic number.

12249778 is a deficient number, since it is larger than the sum of its proper divisors (6124892).

12249778 is an equidigital number, since it uses as much as digits as its factorization.

12249778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124891.

The product of its digits is 56448, while the sum is 40.

The square root of 12249778 is about 3499.9682855706. The cubic root of 12249778 is about 230.5204220546.

The spelling of 12249778 in words is "twelve million, two hundred forty-nine thousand, seven hundred seventy-eight".