1222345778 has 16 divisors (see below), whose sum is σ = 1878898560. Its totient is φ = 596087856.

The previous prime is 1222345763. The next prime is 1222345783. The reversal of 1222345778 is 8775432221.

It is a plaindrome in base 10.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 50951 + ... + 70997.

It is an arithmetic number, because the mean of its divisors is an integer number (117431160).

Almost surely, 2^1222345778 is an apocalyptic number.

1222345778 is a deficient number, since it is larger than the sum of its proper divisors (656552782).

1222345778 is a wasteful number, since it uses less digits than its factorization.

1222345778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20801.

The product of its digits is 188160, while the sum is 41.

The square root of 1222345778 is about 34962.0619815251. The cubic root of 1222345778 is about 1069.2141369118.

Adding to 1222345778 its reverse (8775432221), we get a palindrome (9997777999).

The spelling of 1222345778 in words is "one billion, two hundred twenty-two million, three hundred forty-five thousand, seven hundred seventy-eight".