1227533220 has 36 divisors (see below), whose sum is σ = 3723517980. Its totient is φ = 327342144.

The previous prime is 1227533213. The next prime is 1227533227. The reversal of 1227533220 is 223357221.

It is a happy number.

1227533220 is a `hidden beast` number, since 122 + 7 + 533 + 2 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1227533213) and next prime (1227533227).

It can be written as a sum of positive squares in 2 ways, for example, as 251095716 + 976437504 = 15846^2 + 31248^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1227533227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3409635 + ... + 3409994.

It is an arithmetic number, because the mean of its divisors is an integer number (103431055).

Almost surely, 2^1227533220 is an apocalyptic number.

1227533220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1227533220 is an abundant number, since it is smaller than the sum of its proper divisors (2495984760).

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

1227533220 is a wasteful number, since it uses less digits than its factorization.

1227533220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6819644 (or 6819639 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 1227533220 is about 35036.1701674141. The cubic root of 1227533220 is about 1070.7245274877.

The spelling of 1227533220 in words is "one billion, two hundred twenty-seven million, five hundred thirty-three thousand, two hundred twenty".