55623 has 4 divisors (see below), whose sum is σ = 74168. Its totient is φ = 37080.
The previous prime is 55621. The next prime is 55631. The reversal of 55623 is 32655.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 55623 - 21 = 55621 is a prime.
It is a D-number.
It is a Duffinian number.
It is a nialpdrome in base 7.
It is a self number, because there is not a number n which added to its sum of digits gives 55623.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 55623.
It is not an unprimeable number, because it can be changed into a prime (55621) 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, 9268 + ... + 9273.
It is an arithmetic number, because the mean of its divisors is an integer number (18542).
255623 is an apocalyptic number.
55623 is a deficient number, since it is larger than the sum of its proper divisors (18545).
55623 is a wasteful number, since it uses less digits than its factorization.
55623 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 18544.
The product of its digits is 900, while the sum is 21.
The square root of 55623 is about 235.8452882718. The cubic root of 55623 is about 38.1725760975.
It can be divided in two parts, 5562 and 3, that added together give a triangular number (5565 = T105).
The spelling of 55623 in words is "fifty-five thousand, six hundred twenty-three".
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