1225729872 has 60 divisors (see below), whose sum is σ = 3473795520. Its totient is φ = 403401024.

The previous prime is 1225729861. The next prime is 1225729877. The reversal of 1225729872 is 2789275221.

1225729872 is a `hidden beast` number, since 1 + 2 + 2 + 572 + 9 + 8 + 72 = 666.

It is a super-2 number, since 2×1225729872² = 3004827438226272768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225729877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42498 + ... + 65249.

It is an arithmetic number, because the mean of its divisors is an integer number (57896592).

Almost surely, 2^1225729872 is an apocalyptic number.

1225729872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1225729872 is an abundant number, since it is smaller than the sum of its proper divisors (2248065648).

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

1225729872 is a wasteful number, since it uses less digits than its factorization.

1225729872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107840 (or 107831 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1225729872 is about 35010.4251902201. The cubic root of 1225729872 is about 1070.1999428379.

The spelling of 1225729872 in words is "one billion, two hundred twenty-five million, seven hundred twenty-nine thousand, eight hundred seventy-two".