1271442312 has 128 divisors (see below), whose sum is σ = 4058169600. Its totient is φ = 361304064.

The previous prime is 1271442311. The next prime is 1271442379. The reversal of 1271442312 is 2132441721.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1271442311) 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, 289638 + ... + 293994.

It is an arithmetic number, because the mean of its divisors is an integer number (31704450).

Almost surely, 2^1271442312 is an apocalyptic number.

1271442312 is a gapful number since it is divisible by the number (12) 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 1271442312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2029084800).

1271442312 is an abundant number, since it is smaller than the sum of its proper divisors (2786727288).

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

1271442312 is a wasteful number, since it uses less digits than its factorization.

1271442312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572 (or 4562 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 1271442312 is about 35657.2897455766. The cubic root of 1271442312 is about 1083.3419320711.

The spelling of 1271442312 in words is "one billion, two hundred seventy-one million, four hundred forty-two thousand, three hundred twelve".