1227212800 has 144 divisors (see below), whose sum is σ = 3320881200. Its totient is φ = 446054400.

The previous prime is 1227212773. The next prime is 1227212801. The reversal of 1227212800 is 82127221.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1227212801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562111 + ... + 564289.

It is an arithmetic number, because the mean of its divisors is an integer number (23061675).

Almost surely, 2^1227212800 is an apocalyptic number.

1227212800 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 1227212800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660440600).

1227212800 is an abundant number, since it is smaller than the sum of its proper divisors (2093668400).

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

1227212800 is a wasteful number, since it uses less digits than its factorization.

1227212800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222 (or 2197 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 1227212800 is about 35031.5971659872. The cubic root of 1227212800 is about 1070.6313565106.

It can be divided in two parts, 122721 and 2800, that added together give a palindrome (125521).

The spelling of 1227212800 in words is "one billion, two hundred twenty-seven million, two hundred twelve thousand, eight hundred".