1225796220 has 384 divisors, whose sum is σ = 4499712000. Its totient is φ = 273715200.

The previous prime is 1225796197. The next prime is 1225796239. The reversal of 1225796220 is 226975221.

It is a happy number.

1225796220 is a `hidden beast` number, since 1 + 2 + 2 + 579 + 62 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6159681 + ... + 6159879.

It is an arithmetic number, because the mean of its divisors is an integer number (11718000).

Almost surely, 2^1225796220 is an apocalyptic number.

1225796220 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 1225796220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249856000).

1225796220 is an abundant number, since it is smaller than the sum of its proper divisors (3273915780).

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

1225796220 is a wasteful number, since it uses less digits than its factorization.

1225796220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1225796220 is about 35011.3727237308. The cubic root of 1225796220 is about 1070.2192522432.

The spelling of 1225796220 in words is "one billion, two hundred twenty-five million, seven hundred ninety-six thousand, two hundred twenty".