12242778 has 16 divisors (see below), whose sum is σ = 24649536. Its totient is φ = 4053600.

The previous prime is 12242773. The next prime is 12242779. The reversal of 12242778 is 87724221.

It is a super-2 number, since 2×12242778² = 299771226314568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12242773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5851 + ... + 7662.

It is an arithmetic number, because the mean of its divisors is an integer number (1540596).

Almost surely, 2^12242778 is an apocalyptic number.

12242778 is an abundant number, since it is smaller than the sum of its proper divisors (12406758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12242778 is a wasteful number, since it uses less digits than its factorization.

12242778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13669.

The product of its digits is 12544, while the sum is 33.

The square root of 12242778 is about 3498.9681336074. The cubic root of 12242778 is about 230.4765042405.

Adding to 12242778 its reverse (87724221), we get a palindrome (99966999).

The spelling of 12242778 in words is "twelve million, two hundred forty-two thousand, seven hundred seventy-eight".