25623 has 16 divisors (see below), whose sum is σ = 41440.
Its totient is φ = 15552.
The previous prime is 25621. The next prime is 25633. The reversal of 25623 is 32652.
It is not a de Polignac number, because 25623 - 21 = 25621 is a prime.
It is an Ulam number.
It is a Duffinian number.
25623 is a lucky number.
It is a nialpdrome in base 13.
It is a junction number, because it is equal to n+sod(n) for n = 25596 and 25605.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (25621) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315 + ... + 387.
It is an arithmetic number, because the mean of its divisors is an integer number (2590).
225623 is an apocalyptic number.
25623 is a deficient number, since it is larger than the sum of its proper divisors (15817).
25623 is a wasteful number, since it uses less digits than its factorization.
25623 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 95 (or 89 counting only the distinct ones).
The product of its digits is 360, while the sum is 18.
The square root of 25623 is about 160.0718588634.
The cubic root of 25623 is about 29.4810756726.
It can be divided in two parts, 2 and 5623, that added together give a square (5625 = 752).
The spelling of 25623 in words is "twenty-five thousand, six hundred twenty-three".