1227133656 has 144 divisors (see below), whose sum is σ = 3956495400. Its totient is φ = 342413568.

The previous prime is 1227133643. The next prime is 1227133693. The reversal of 1227133656 is 6563317221.

1227133656 is a `hidden beast` number, since 1 + 2 + 271 + 336 + 56 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1227133656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 147660 + ... + 155748.

Almost surely, 2^1227133656 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 1227133656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1978247700).

1227133656 is an abundant number, since it is smaller than the sum of its proper divisors (2729361744).

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

1227133656 is a wasteful number, since it uses less digits than its factorization.

1227133656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8158 (or 8144 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 1227133656 is about 35030.4675389867. The cubic root of 1227133656 is about 1070.6083407061.

The spelling of 1227133656 in words is "one billion, two hundred twenty-seven million, one hundred thirty-three thousand, six hundred fifty-six".