1225263220 has 48 divisors (see below), whose sum is σ = 2661474816. Its totient is φ = 473328000.

The previous prime is 1225263217. The next prime is 1225263239. The reversal of 1225263220 is 223625221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352290 + ... + 355750.

It is an arithmetic number, because the mean of its divisors is an integer number (55447392).

Almost surely, 2^1225263220 is an apocalyptic number.

1225263220 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 1225263220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330737408).

1225263220 is an abundant number, since it is smaller than the sum of its proper divisors (1436211596).

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

1225263220 is a wasteful number, since it uses less digits than its factorization.

1225263220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4072 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1225263220 is about 35003.7600837396. The cubic root of 1225263220 is about 1070.0641123840.

Adding to 1225263220 its reverse (223625221), we get a palindrome (1448888441).

The spelling of 1225263220 in words is "one billion, two hundred twenty-five million, two hundred sixty-three thousand, two hundred twenty".