1222721440 has 72 divisors (see below), whose sum is σ = 3048861060. Its totient is φ = 463325184.

The previous prime is 1222721419. The next prime is 1222721483. The reversal of 1222721440 is 441272221.

It can be written as a sum of positive squares in 2 ways, for example, as 1154096784 + 68624656 = 33972^2 + 8284^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47176 + ... + 68344.

Almost surely, 2^1222721440 is an apocalyptic number.

1222721440 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 1222721440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524430530).

1222721440 is an abundant number, since it is smaller than the sum of its proper divisors (1826139620).

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

1222721440 is a wasteful number, since it uses less digits than its factorization.

1222721440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21222 (or 21195 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 1222721440 is about 34967.4339922162. The cubic root of 1222721440 is about 1069.3236591075.

Adding to 1222721440 its reverse (441272221), we get a palindrome (1663993661).

The spelling of 1222721440 in words is "one billion, two hundred twenty-two million, seven hundred twenty-one thousand, four hundred forty".