13403 has 4 divisors (see below), whose sum is σ = 14448.
Its totient is φ = 12360.
The previous prime is 13399. The next prime is 13411. The reversal of 13403 is 30431.
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 13403 - 22 = 13399 is a prime.
It is a Duffinian number.
It is a plaindrome in base 16.
It is not an unprimeable number, because it can be changed into a prime (13463) 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, 503 + ... + 528.
It is an arithmetic number, because the mean of its divisors is an integer number (3612).
213403 is an apocalyptic number.
13403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.
13403 is a deficient number, since it is larger than the sum of its proper divisors (1045).
13403 is a wasteful number, since it uses less digits than its factorization.
13403 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1044.
The product of its (nonzero) digits is 36, while the sum is 11.
The square root of 13403 is about 115.7713263291.
The cubic root of 13403 is about 23.7538497914.
Adding to 13403 its reverse (30431), we get a palindrome (43834).
The spelling of 13403 in words is "thirteen thousand, four hundred three".