1023403 has 4 divisors (see below), whose sum is σ = 1056448. Its totient is φ = 990360.

The previous prime is 1023391. The next prime is 1023409. The reversal of 1023403 is 3043201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3043201 = 7 ⋅434743.

It is a cyclic number.

It is not a de Polignac number, because 1023403 - 2⁹ = 1022891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023409) 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, 16476 + ... + 16537.

It is an arithmetic number, because the mean of its divisors is an integer number (264112).

2^1023403 is an apocalyptic number.

1023403 is a deficient number, since it is larger than the sum of its proper divisors (33045).

1023403 is an equidigital number, since it uses as much as digits as its factorization.

1023403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33044.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 1023403 is about 1011.6338270343. The cubic root of 1023403 is about 100.7740923487.

Adding to 1023403 its reverse (3043201), we get a palindrome (4066604).

The spelling of 1023403 in words is "one million, twenty-three thousand, four hundred three".