1275640240 has 80 divisors (see below), whose sum is σ = 3567985920. Its totient is φ = 414339840.

The previous prime is 1275640211. The next prime is 1275640241. The reversal of 1275640240 is 420465721.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1275640241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49306 + ... + 70585.

It is an arithmetic number, because the mean of its divisors is an integer number (44599824).

Almost surely, 2^1275640240 is an apocalyptic number.

1275640240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275640240 is an abundant number, since it is smaller than the sum of its proper divisors (2292345680).

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

1275640240 is a wasteful number, since it uses less digits than its factorization.

1275640240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119930 (or 119924 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 1275640240 is about 35716.1061707460. The cubic root of 1275640240 is about 1084.5329142578.

The spelling of 1275640240 in words is "one billion, two hundred seventy-five million, six hundred forty thousand, two hundred forty".