1220445306 has 40 divisors (see below), whose sum is σ = 2749089024. Its totient is φ = 404674920.

The previous prime is 1220445301. The next prime is 1220445323. The reversal of 1220445306 is 6035440221.

1220445306 is a `hidden beast` number, since 1 + 2 + 204 + 453 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1220445306.

It is not an unprimeable number, because it can be changed into a prime (1220445301) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11221 + ... + 50663.

Almost surely, 2^1220445306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220445306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374544512).

1220445306 is an abundant number, since it is smaller than the sum of its proper divisors (1528643718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220445306 is a wasteful number, since it uses less digits than its factorization.

1220445306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39648 (or 39639 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1220445306 is about 34934.8723484143. The cubic root of 1220445306 is about 1068.6597205366.

Adding to 1220445306 its reverse (6035440221), we get a palindrome (7255885527).

The spelling of 1220445306 in words is "one billion, two hundred twenty million, four hundred forty-five thousand, three hundred six".