1280003 has 4 divisors (see below), whose sum is σ = 1304208. Its totient is φ = 1255800.

The previous prime is 1279997. The next prime is 1280023. The reversal of 1280003 is 3000821.

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 1280003 - 2¹⁸ = 1017859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280003.

It is not an unprimeable number, because it can be changed into a prime (1280023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12023 + ... + 12128.

It is an arithmetic number, because the mean of its divisors is an integer number (326052).

2^1280003 is an apocalyptic number.

1280003 is a deficient number, since it is larger than the sum of its proper divisors (24205).

1280003 is an equidigital number, since it uses as much as digits as its factorization.

1280003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24204.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1280003 is about 1131.3721757229. The cubic root of 1280003 is about 108.5767894893.

Adding to 1280003 its reverse (3000821), we get a palindrome (4280824).

The spelling of 1280003 in words is "one million, two hundred eighty thousand, three".