1275643240 has 32 divisors (see below), whose sum is σ = 2871465480. Its totient is φ = 510031872.

The previous prime is 1275643219. The next prime is 1275643249. The reversal of 1275643240 is 423465721.

It can be written as a sum of positive squares in 4 ways, for example, as 1146093316 + 129549924 = 33854^2 + 11382^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1275643196 and 1275643205.

It is not an unprimeable number, because it can be changed into a prime (1275643249) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 107692 + ... + 118948.

Almost surely, 2^1275643240 is an apocalyptic number.

1275643240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1275643240 is an abundant number, since it is smaller than the sum of its proper divisors (1595822240).

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

1275643240 is a wasteful number, since it uses less digits than its factorization.

1275643240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14101 (or 14097 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1275643240 is about 35716.1481685806. The cubic root of 1275643240 is about 1084.5337644443.

The spelling of 1275643240 in words is "one billion, two hundred seventy-five million, six hundred forty-three thousand, two hundred forty".