1271205372 has 24 divisors (see below), whose sum is σ = 3068427600. Its totient is φ = 409123456.

The previous prime is 1271205329. The next prime is 1271205373. The reversal of 1271205372 is 2735021721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271205373) 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, 1826097 + ... + 1826792.

It is an arithmetic number, because the mean of its divisors is an integer number (127851150).

Almost surely, 2^1271205372 is an apocalyptic number.

1271205372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1271205372 is an abundant number, since it is smaller than the sum of its proper divisors (1797222228).

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

1271205372 is a wasteful number, since it uses less digits than its factorization.

1271205372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652925 (or 3652923 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 1271205372 is about 35653.9671284978. The cubic root of 1271205372 is about 1083.2746323907.

The spelling of 1271205372 in words is "one billion, two hundred seventy-one million, two hundred five thousand, three hundred seventy-two".