1306780503 has 16 divisors (see below), whose sum is σ = 2013661440. Its totient is φ = 738340416.

The previous prime is 1306780483. The next prime is 1306780507. The reversal of 1306780503 is 3050876031.

It is a happy number.

It is not a de Polignac number, because 1306780503 - 2¹⁴ = 1306764119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306780507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347725 + ... + 351462.

It is an arithmetic number, because the mean of its divisors is an integer number (125853840).

Almost surely, 2^1306780503 is an apocalyptic number.

1306780503 is a deficient number, since it is larger than the sum of its proper divisors (706880937).

1306780503 is an equidigital number, since it uses as much as digits as its factorization.

1306780503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699286.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1306780503 is about 36149.4191239638. The cubic root of 1306780503 is about 1093.2870789495.

The spelling of 1306780503 in words is "one billion, three hundred six million, seven hundred eighty thousand, five hundred three".