213423 has 8 divisors (see below), whose sum is σ = 325248.
Its totient is φ = 121944.
The previous prime is 213407. The next prime is 213449. The reversal of 213423 is 324312.
Adding to 213423 its reverse (324312), we get a palindrome (537735).
Subtracting 213423 from its reverse (324312), we obtain a square (110889 = 3332).
It can be divided in two parts, 213 and 423, that added together give a palindrome (636).
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 213423 - 24 = 213407 is a prime.
213423 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (213023) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5061 + ... + 5102.
It is an arithmetic number, because the mean of its divisors is an integer number (40656).
2213423 is an apocalyptic number.
213423 is a deficient number, since it is larger than the sum of its proper divisors (111825).
213423 is a wasteful number, since it uses less digits than its factorization.
213423 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10173.
The product of its digits is 144, while the sum is 15.
The square root of 213423 is about 461.9772721682.
The cubic root of 213423 is about 59.7604336279.
The spelling of 213423 in words is "two hundred thirteen thousand, four hundred twenty-three".