1222156800 has 270 divisors, whose sum is σ = 4416637797. Its totient is φ = 322744320.

The previous prime is 1222156787. The next prime is 1222156813. The reversal of 1222156800 is 86512221.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is an interprime number because it is at equal distance from previous prime (1222156787) and next prime (1222156813).

It can be written as a sum of positive squares in 2 ways, for example, as 1197713664 + 24443136 = 34608^2 + 4944^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24720.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11865549 + ... + 11865651.

Almost surely, 2^1222156800 is an apocalyptic number.

1222156800 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 1222156800

1222156800 is an abundant number, since it is smaller than the sum of its proper divisors (3194480997).

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

1222156800 is an equidigital number, since it uses as much as digits as its factorization.

1222156800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 113 counting only the distinct ones).

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

The square root of 1222156800 is about 34959.3592618629. The cubic root of 1222156800 is about 1069.1590329288.

The spelling of 1222156800 in words is "one billion, two hundred twenty-two million, one hundred fifty-six thousand, eight hundred".