1271538240 has 168 divisors, whose sum is σ = 4696431552. Its totient is φ = 290626560.

The previous prime is 1271538221. The next prime is 1271538293. The reversal of 1271538240 is 428351721.

It is a tau number, because it is divible by the number of its divisors (168).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33525 + ... + 60555.

Almost surely, 2^1271538240 is an apocalyptic number.

1271538240 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 1271538240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2348215776).

1271538240 is an abundant number, since it is smaller than the sum of its proper divisors (3424893312).

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

1271538240 is a wasteful number, since it uses less digits than its factorization.

1271538240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27065 (or 27048 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1271538240 is about 35658.6348588950. The cubic root of 1271538240 is about 1083.3691767759.

Adding to 1271538240 its reverse (428351721), we get a palindrome (1699889961).

The spelling of 1271538240 in words is "one billion, two hundred seventy-one million, five hundred thirty-eight thousand, two hundred forty".