1280403139403 has 4 divisors (see below), whose sum is σ = 1289614672920. Its totient is φ = 1271191605888.

The previous prime is 1280403139373. The next prime is 1280403139459. The reversal of 1280403139403 is 3049313040821.

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

It is a cyclic number.

It is not a de Polignac number, because 1280403139403 - 2¹⁰ = 1280403138379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280403136403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4605766550 + ... + 4605766827.

It is an arithmetic number, because the mean of its divisors is an integer number (322403668230).

Almost surely, 2^{1280403139403} is an apocalyptic number.

1280403139403 is a deficient number, since it is larger than the sum of its proper divisors (9211533517).

1280403139403 is an equidigital number, since it uses as much as digits as its factorization.

1280403139403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9211533516.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 1280403139403 in words is "one trillion, two hundred eighty billion, four hundred three million, one hundred thirty-nine thousand, four hundred three".