1222225920 has 312 divisors, whose sum is σ = 4472286000. Its totient is φ = 307888128.

The previous prime is 1222225919. The next prime is 1222225969. The reversal of 1222225920 is 295222221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3501906 + ... + 3502254.

It is an arithmetic number, because the mean of its divisors is an integer number (14334250).

Almost surely, 2^1222225920 is an apocalyptic number.

1222225920 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 1222225920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236143000).

1222225920 is an abundant number, since it is smaller than the sum of its proper divisors (3250060080).

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

1222225920 is a wasteful number, since it uses less digits than its factorization.

1222225920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1222225920 is about 34960.3478243567. The cubic root of 1222225920 is about 1069.1791882474.

The spelling of 1222225920 in words is "one billion, two hundred twenty-two million, two hundred twenty-five thousand, nine hundred twenty".