1227556140 has 24 divisors (see below), whose sum is σ = 3437157360. Its totient is φ = 327348288.

The previous prime is 1227556129. The next prime is 1227556151. The reversal of 1227556140 is 416557221.

It is an interprime number because it is at equal distance from previous prime (1227556129) and next prime (1227556151).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10229575 + ... + 10229694.

It is an arithmetic number, because the mean of its divisors is an integer number (143214890).

Almost surely, 2^1227556140 is an apocalyptic number.

1227556140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1227556140 is an abundant number, since it is smaller than the sum of its proper divisors (2209601220).

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

1227556140 is a wasteful number, since it uses less digits than its factorization.

1227556140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20459281 (or 20459279 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 1227556140 is about 35036.4972564325. The cubic root of 1227556140 is about 1070.7311914902.

The spelling of 1227556140 in words is "one billion, two hundred twenty-seven million, five hundred fifty-six thousand, one hundred forty".