10403 has 4 divisors (see below), whose sum is σ = 10608. Its totient is φ = 10200.

The previous prime is 10399. The next prime is 10427. The reversal of 10403 is 30401.

Added to its reverse (30401) it gives a square (40804 = 202²).

It is a Cunningham number, because it is equal to 102²-1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10403 - 2² = 10399 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (10433) 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, 50 + ... + 152.

It is an arithmetic number, because the mean of its divisors is an integer number (2652).

2¹⁰⁴⁰³ is an apocalyptic number.

10403 is a deficient number, since it is larger than the sum of its proper divisors (205).

10403 is a wasteful number, since it uses less digits than its factorization.

10403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 10403 is about 101.9950979214. The cubic root of 10403 is about 21.8299562919.

Adding to 10403 its reverse (30401), we get a palindrome (40804).

The spelling of 10403 in words is "ten thousand, four hundred three", and thus it is an iban number.