1271307740 has 12 divisors (see below), whose sum is σ = 2669746296. Its totient is φ = 508523088.

The previous prime is 1271307733. The next prime is 1271307749. The reversal of 1271307740 is 477031721.

It is a junction number, because it is equal to n+sod(n) for n = 1271307697 and 1271307706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271307749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31782674 + ... + 31782713.

It is an arithmetic number, because the mean of its divisors is an integer number (222478858).

Almost surely, 2^1271307740 is an apocalyptic number.

1271307740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271307740 is an abundant number, since it is smaller than the sum of its proper divisors (1398438556).

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

1271307740 is a wasteful number, since it uses less digits than its factorization.

1271307740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63565396 (or 63565394 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 1271307740 is about 35655.4026761724. The cubic root of 1271307740 is about 1083.3037096962.

The spelling of 1271307740 in words is "one billion, two hundred seventy-one million, three hundred seven thousand, seven hundred forty".