1028403 has 16 divisors (see below), whose sum is σ = 1562400. Its totient is φ = 668160.

The previous prime is 1028393. The next prime is 1028411. The reversal of 1028403 is 3048201.

It is a happy number.

It is not a de Polignac number, because 1028403 - 2⁹ = 1027891 is a prime.

It is a super-2 number, since 2×1028403² = 2115225460818, which contains 22 as substring.

1028403 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1028473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643 + ... + 1571.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2^1028403 is an apocalyptic number.

1028403 is a deficient number, since it is larger than the sum of its proper divisors (533997).

1028403 is an equidigital number, since it uses as much as digits as its factorization.

1028403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1028403 is about 1014.1020658691. The cubic root of 1028403 is about 100.9379418135.

It can be divided in two parts, 1028 and 403, that added together give a triangular number (1431 = T₅₃).

The spelling of 1028403 in words is "one million, twenty-eight thousand, four hundred three".