1222245778 has 8 divisors (see below), whose sum is σ = 1974397068. Its totient is φ = 564113424.

The previous prime is 1222245769. The next prime is 1222245781. The reversal of 1222245778 is 8775422221.

It can be written as a sum of positive squares in 2 ways, for example, as 1084582489 + 137663289 = 32933^2 + 11733^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1222245778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23504701 + ... + 23504752.

Almost surely, 2^1222245778 is an apocalyptic number.

1222245778 is a deficient number, since it is larger than the sum of its proper divisors (752151290).

1222245778 is a wasteful number, since it uses less digits than its factorization.

1222245778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47009468.

The product of its digits is 125440, while the sum is 40.

The square root of 1222245778 is about 34960.6318306749. The cubic root of 1222245778 is about 1069.1849786787.

Adding to 1222245778 its reverse (8775422221), we get a palindrome (9997667999).

The spelling of 1222245778 in words is "one billion, two hundred twenty-two million, two hundred forty-five thousand, seven hundred seventy-eight".