1266540393 has 16 divisors (see below), whose sum is σ = 1704001536. Its totient is φ = 836735760.

The previous prime is 1266540391. The next prime is 1266540421. The reversal of 1266540393 is 3930456621.

1266540393 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 1266540393 - 2¹ = 1266540391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266540391) 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, 487528 + ... + 490118.

It is an arithmetic number, because the mean of its divisors is an integer number (106500096).

Almost surely, 2^1266540393 is an apocalyptic number.

It is an amenable number.

1266540393 is a deficient number, since it is larger than the sum of its proper divisors (437461143).

1266540393 is a wasteful number, since it uses less digits than its factorization.

1266540393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 1266540393 is about 35588.4868040213. The cubic root of 1266540393 is about 1081.9479000998.

The spelling of 1266540393 in words is "one billion, two hundred sixty-six million, five hundred forty thousand, three hundred ninety-three".