1288403 has 4 divisors (see below), whose sum is σ = 1297200. Its totient is φ = 1279608.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288403 is 3048821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3048821 = 193 ⋅15797.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4175 + ... + 4472.

It is an arithmetic number, because the mean of its divisors is an integer number (324300).

2^1288403 is an apocalyptic number.

1288403 is a deficient number, since it is larger than the sum of its proper divisors (8797).

1288403 is an equidigital number, since it uses as much as digits as its factorization.

1288403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8796.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 1288403 is about 1135.0784113884. The cubic root of 1288403 is about 108.8137829911.

The spelling of 1288403 in words is "one million, two hundred eighty-eight thousand, four hundred three".