1265986260 has 576 divisors, whose sum is σ = 5283532800. Its totient is φ = 246343680.

The previous prime is 1265986247. The next prime is 1265986279. The reversal of 1265986260 is 626895621.

1265986260 is a `hidden beast` number, since 12 + 6 + 5 + 9 + 8 + 626 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6361641 + ... + 6361839.

It is an arithmetic number, because the mean of its divisors is an integer number (9172800).

It is a vampire number, since it can be written as 20196 ⋅ 62685 (with its own digits).

Almost surely, 2^1265986260 is an apocalyptic number.

1265986260 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 1265986260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2641766400).

1265986260 is an abundant number, since it is smaller than the sum of its proper divisors (4017546540).

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

1265986260 is a wasteful number, since it uses less digits than its factorization.

1265986260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1265986260 is about 35580.7006676372. The cubic root of 1265986260 is about 1081.7900868691.

The spelling of 1265986260 in words is "one billion, two hundred sixty-five million, nine hundred eighty-six thousand, two hundred sixty".