1280879400403 has 4 divisors (see below), whose sum is σ = 1280882703208. Its totient is φ = 1280876097600.

The previous prime is 1280879400373. The next prime is 1280879400413. The reversal of 1280879400403 is 3040049780821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280879400403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280879400413) 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, 978201 + ... + 1875802.

It is an arithmetic number, because the mean of its divisors is an integer number (320220675802).

Almost surely, 2^{1280879400403} is an apocalyptic number.

1280879400403 is a deficient number, since it is larger than the sum of its proper divisors (3302805).

1280879400403 is an equidigital number, since it uses as much as digits as its factorization.

1280879400403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302804.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 1280879400403 in words is "one trillion, two hundred eighty billion, eight hundred seventy-nine million, four hundred thousand, four hundred three".