1225206272 has 40 divisors (see below), whose sum is σ = 2489572800. Its totient is φ = 602205184.

The previous prime is 1225206263. The next prime is 1225206313. The reversal of 1225206272 is 2726025221.

It is a super-2 number, since 2×1225206272² = 3002260817896275968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9929 + ... + 50487.

It is an arithmetic number, because the mean of its divisors is an integer number (62239320).

Almost surely, 2^1225206272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225206272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244786400).

1225206272 is an abundant number, since it is smaller than the sum of its proper divisors (1264366528).

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

1225206272 is an frugal number, since it uses more digits than its factorization.

1225206272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40636 (or 40620 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1225206272 is about 35002.9466188205. The cubic root of 1225206272 is about 1070.0475339177.

The spelling of 1225206272 in words is "one billion, two hundred twenty-five million, two hundred six thousand, two hundred seventy-two".