1271506240 has 56 divisors (see below), whose sum is σ = 3159434880. Its totient is φ = 486486528.

The previous prime is 1271506219. The next prime is 1271506283. The reversal of 1271506240 is 426051721.

It is a junction number, because it is equal to n+sod(n) for n = 1271506199 and 1271506208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79020 + ... + 93739.

It is an arithmetic number, because the mean of its divisors is an integer number (56418480).

Almost surely, 2^1271506240 is an apocalyptic number.

1271506240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271506240 is an abundant number, since it is smaller than the sum of its proper divisors (1887928640).

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

1271506240 is a wasteful number, since it uses less digits than its factorization.

1271506240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172799 (or 172789 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1271506240 is about 35658.1861568981. The cubic root of 1271506240 is about 1083.3600885437.

Adding to 1271506240 its reverse (426051721), we get a palindrome (1697557961).

The spelling of 1271506240 in words is "one billion, two hundred seventy-one million, five hundred six thousand, two hundred forty".