1271393280 has 352 divisors, whose sum is σ = 4792927680. Its totient is φ = 318504960.

The previous prime is 1271393267. The next prime is 1271393311. The reversal of 1271393280 is 823931721.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2349810 + ... + 2350350.

Almost surely, 2^1271393280 is an apocalyptic number.

1271393280 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 1271393280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2396463840).

1271393280 is an abundant number, since it is smaller than the sum of its proper divisors (3521534400).

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

1271393280 is a wasteful number, since it uses less digits than its factorization.

1271393280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1271393280 is about 35656.6021937032. The cubic root of 1271393280 is about 1083.3280058647.

The spelling of 1271393280 in words is "one billion, two hundred seventy-one million, three hundred ninety-three thousand, two hundred eighty".