55403 has 4 divisors (see below), whose sum is σ = 58680.
Its totient is φ = 52128.
The previous prime is 55399. The next prime is 55411. The reversal of 55403 is 30455.
Adding to 55403 its reverse (30455), we get a palindrome (85858).
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30455 = 5 ⋅6091.
It is a cyclic number.
It is not a de Polignac number, because 55403 - 22 = 55399 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 3259 = 55403 / (5 + 5 + 4 + 0 + 3).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (55103) 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, 1613 + ... + 1646.
It is an arithmetic number, because the mean of its divisors is an integer number (14670).
255403 is an apocalyptic number.
55403 is a deficient number, since it is larger than the sum of its proper divisors (3277).
55403 is a wasteful number, since it uses less digits than its factorization.
55403 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3276.
The product of its (nonzero) digits is 300, while the sum is 17.
The square root of 55403 is about 235.3784187219.
The cubic root of 55403 is about 38.1221828967.
The spelling of 55403 in words is "fifty-five thousand, four hundred three".