1220225000 has 48 divisors (see below), whose sum is σ = 2859777900. Its totient is φ = 488080000.

The previous prime is 1220224991. The next prime is 1220225021. The reversal of 1220225000 is 5220221.

It can be written as a sum of positive squares in 6 ways, for example, as 213685924 + 1006539076 = 14618^2 + 31726^2 .

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, 596 + ... + 49404.

Almost surely, 2^1220225000 is an apocalyptic number.

1220225000 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 1220225000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1429888950).

1220225000 is an abundant number, since it is smaller than the sum of its proper divisors (1639552900).

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

1220225000 is an frugal number, since it uses more digits than its factorization.

1220225000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48840 (or 48816 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 1220225000 is about 34931.7191102871. The cubic root of 1220225000 is about 1068.5954144142.

Adding to 1220225000 its reverse (5220221), we get a palindrome (1225445221).

The spelling of 1220225000 in words is "one billion, two hundred twenty million, two hundred twenty-five thousand".