1220706805 has 16 divisors (see below), whose sum is σ = 1484786160. Its totient is φ = 963353088.

The previous prime is 1220706793. The next prime is 1220706821. The reversal of 1220706805 is 5086070221.

It can be written as a sum of positive squares in 8 ways, for example, as 65318724 + 1155388081 = 8082^2 + 33991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220706805 - 2⁷ = 1220706677 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 15 ways as a sum of consecutive naturals, for example, 122179 + ... + 131791.

It is an arithmetic number, because the mean of its divisors is an integer number (92799135).

Almost surely, 2^1220706805 is an apocalyptic number.

It is an amenable number.

1220706805 is a deficient number, since it is larger than the sum of its proper divisors (264079355).

1220706805 is a wasteful number, since it uses less digits than its factorization.

1220706805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9960.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1220706805 is about 34938.6148122675. The cubic root of 1220706805 is about 1068.7360406279.

The spelling of 1220706805 in words is "one billion, two hundred twenty million, seven hundred six thousand, eight hundred five".