1020403 has 4 divisors (see below), whose sum is σ = 1030608. Its totient is φ = 1010200.

The previous prime is 1020401. The next prime is 1020407. The reversal of 1020403 is 3040201.

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 1020403 - 2¹ = 1020401 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 1020403.

It is not an unprimeable number, because it can be changed into a prime (1020401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4951 + ... + 5152.

It is an arithmetic number, because the mean of its divisors is an integer number (257652).

2^1020403 is an apocalyptic number.

1020403 is a deficient number, since it is larger than the sum of its proper divisors (10205).

1020403 is a wasteful number, since it uses less digits than its factorization.

1020403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10204.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 1020403 is about 1010.1499888630. The cubic root of 1020403 is about 100.6755263657.

Adding to 1020403 its reverse (3040201), we get a palindrome (4060604).

The spelling of 1020403 in words is "one million, twenty thousand, four hundred three".