1220789853 has 8 divisors (see below), whose sum is σ = 1808577600. Its totient is φ = 813859884.

The previous prime is 1220789849. The next prime is 1220789861. The reversal of 1220789853 is 3589870221.

It is a happy number.

It is not a de Polignac number, because 1220789853 - 2² = 1220789849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220789799 and 1220789808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220789893) 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, 22607193 + ... + 22607246.

It is an arithmetic number, because the mean of its divisors is an integer number (226072200).

Almost surely, 2^1220789853 is an apocalyptic number.

It is an amenable number.

1220789853 is a deficient number, since it is larger than the sum of its proper divisors (587787747).

1220789853 is an equidigital number, since it uses as much as digits as its factorization.

1220789853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45214448 (or 45214442 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1220789853 is about 34939.8032764926. The cubic root of 1220789853 is about 1068.7602764170.

The spelling of 1220789853 in words is "one billion, two hundred twenty million, seven hundred eighty-nine thousand, eight hundred fifty-three".