1225035220 has 48 divisors (see below), whose sum is σ = 2651096448. Its totient is φ = 475148160.

The previous prime is 1225035199. The next prime is 1225035221. The reversal of 1225035220 is 225305221.

It is a super-2 number, since 2×1225035220² = 3001422580480896800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1225035191 and 1225035200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225035221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227479 + ... + 232801.

It is an arithmetic number, because the mean of its divisors is an integer number (55231176).

Almost surely, 2^1225035220 is an apocalyptic number.

1225035220 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 1225035220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325548224).

1225035220 is an abundant number, since it is smaller than the sum of its proper divisors (1426061228).

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

1225035220 is a wasteful number, since it uses less digits than its factorization.

1225035220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680 (or 5678 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 1225035220 is about 35000.5031392407. The cubic root of 1225035220 is about 1069.9977348774.

The spelling of 1225035220 in words is "one billion, two hundred twenty-five million, thirty-five thousand, two hundred twenty".