1260840265 has 4 divisors (see below), whose sum is σ = 1513008324. Its totient is φ = 1008672208.

The previous prime is 1260840263. The next prime is 1260840271. The reversal of 1260840265 is 5620480621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 458987776 + 801852489 = 21424^2 + 28317^2 .

It is a cyclic number.

It is not a de Polignac number, because 1260840265 - 2¹ = 1260840263 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1260840265.

It is not an unprimeable number, because it can be changed into a prime (1260840263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126084022 + ... + 126084031.

It is an arithmetic number, because the mean of its divisors is an integer number (378252081).

Almost surely, 2^1260840265 is an apocalyptic number.

It is an amenable number.

1260840265 is a deficient number, since it is larger than the sum of its proper divisors (252168059).

1260840265 is an equidigital number, since it uses as much as digits as its factorization.

1260840265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252168058.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1260840265 is about 35508.3126183152. The cubic root of 1260840265 is about 1080.3223389126.

The spelling of 1260840265 in words is "one billion, two hundred sixty million, eight hundred forty thousand, two hundred sixty-five".