1227861216 has 72 divisors (see below), whose sum is σ = 3572969400. Its totient is φ = 399764736.

The previous prime is 1227861203. The next prime is 1227861269. The reversal of 1227861216 is 6121687221.

1227861216 is a `hidden beast` number, since 1 + 2 + 27 + 8 + 612 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37191 + ... + 61958.

It is an arithmetic number, because the mean of its divisors is an integer number (49624575).

Almost surely, 2^1227861216 is an apocalyptic number.

1227861216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1227861216 is an abundant number, since it is smaller than the sum of its proper divisors (2345108184).

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

1227861216 is a wasteful number, since it uses less digits than its factorization.

1227861216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99208 (or 99197 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1227861216 is about 35040.8506746055. The cubic root of 1227861216 is about 1070.8198846049.

The spelling of 1227861216 in words is "one billion, two hundred twenty-seven million, eight hundred sixty-one thousand, two hundred sixteen".