1222516800 has 210 divisors, whose sum is σ = 4494140618. Its totient is φ = 325969920.

The previous prime is 1222516717. The next prime is 1222516807. The reversal of 1222516800 is 86152221.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 144576576 + 1077940224 = 12024^2 + 32832^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1222516807) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 124884 + ... + 134316.

Almost surely, 2^1222516800 is an apocalyptic number.

1222516800 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 1222516800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2247070309).

1222516800 is an abundant number, since it is smaller than the sum of its proper divisors (3271623818).

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

1222516800 is an equidigital number, since it uses as much as digits as its factorization.

1222516800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9467 (or 9443 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1222516800 is about 34964.5077185422. The cubic root of 1222516800 is about 1069.2640002200.

The spelling of 1222516800 in words is "one billion, two hundred twenty-two million, five hundred sixteen thousand, eight hundred".