1226729556 has 48 divisors (see below), whose sum is σ = 3425060800. Its totient is φ = 377454816.

The previous prime is 1226729549. The next prime is 1226729597. The reversal of 1226729556 is 6559276221.

1226729556 is a `hidden beast` number, since 1 + 2 + 26 + 72 + 9 + 556 = 666.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 435466 + ... + 438273.

Almost surely, 2^1226729556 is an apocalyptic number.

It is an amenable number.

1226729556 is an abundant number, since it is smaller than the sum of its proper divisors (2198331244).

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

1226729556 is a wasteful number, since it uses less digits than its factorization.

1226729556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873765 (or 873757 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 1226729556 is about 35024.6992278306. The cubic root of 1226729556 is about 1070.4908092738.

The spelling of 1226729556 in words is "one billion, two hundred twenty-six million, seven hundred twenty-nine thousand, five hundred fifty-six".