1271477220 has 96 divisors (see below), whose sum is σ = 3841907328. Its totient is φ = 312333312.

The previous prime is 1271477177. The next prime is 1271477227. The reversal of 1271477220 is 227741721.

It is not an unprimeable number, because it can be changed into a prime (1271477227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456472 + ... + 459248.

It is an arithmetic number, because the mean of its divisors is an integer number (40019868).

Almost surely, 2^1271477220 is an apocalyptic number.

1271477220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271477220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920953664).

1271477220 is an abundant number, since it is smaller than the sum of its proper divisors (2570430108).

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

1271477220 is a wasteful number, since it uses less digits than its factorization.

1271477220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3389 (or 3387 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 1271477220 is about 35657.7792353927. The cubic root of 1271477220 is about 1083.3518465212.

The spelling of 1271477220 in words is "one billion, two hundred seventy-one million, four hundred seventy-seven thousand, two hundred twenty".