1220989200 has 120 divisors (see below), whose sum is σ = 3920880000. Its totient is φ = 324794880.

The previous prime is 1220989199. The next prime is 1220989213. The reversal of 1220989200 is 29890221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 609801 + ... + 611799.

It is an arithmetic number, because the mean of its divisors is an integer number (32674000).

Almost surely, 2^1220989200 is an apocalyptic number.

1220989200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220989200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1960440000).

1220989200 is an abundant number, since it is smaller than the sum of its proper divisors (2699890800).

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

1220989200 is a wasteful number, since it uses less digits than its factorization.

1220989200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529 (or 2518 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1220989200 is about 34942.6558807427. The cubic root of 1220989200 is about 1068.8184471056.

The spelling of 1220989200 in words is "one billion, two hundred twenty million, nine hundred eighty-nine thousand, two hundred".