1222220805 has 64 divisors (see below), whose sum is σ = 2273564160. Its totient is φ = 555641856.

The previous prime is 1222220789. The next prime is 1222220837. The reversal of 1222220805 is 5080222221.

It is not a de Polignac number, because 1222220805 - 2⁴ = 1222220789 is a prime.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 125367 + ... + 134763.

It is an arithmetic number, because the mean of its divisors is an integer number (35524440).

Almost surely, 2^1222220805 is an apocalyptic number.

1222220805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1222220805 is a deficient number, since it is larger than the sum of its proper divisors (1051343355).

1222220805 is a wasteful number, since it uses less digits than its factorization.

1222220805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 1222220805 is about 34960.2746699736. The cubic root of 1222220805 is about 1069.1776967449.

The spelling of 1222220805 in words is "one billion, two hundred twenty-two million, two hundred twenty thousand, eight hundred five".