1271982940 has 24 divisors (see below), whose sum is σ = 2711035152. Its totient is φ = 501198720.

The previous prime is 1271982913. The next prime is 1271982941. The reversal of 1271982940 is 492891721.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271982941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473281 + ... + 475960.

It is an arithmetic number, because the mean of its divisors is an integer number (112959798).

Almost surely, 2^1271982940 is an apocalyptic number.

1271982940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271982940 is an abundant number, since it is smaller than the sum of its proper divisors (1439052212).

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

1271982940 is a wasteful number, since it uses less digits than its factorization.

1271982940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949317 (or 949315 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1271982940 is about 35664.8698301284. The cubic root of 1271982940 is about 1083.4954590233.

It can be divided in two parts, 12719 and 82940, that added together give a palindrome (95659).

The spelling of 1271982940 in words is "one billion, two hundred seventy-one million, nine hundred eighty-two thousand, nine hundred forty".