242205 has 16 divisors (see below), whose sum is σ = 394944.
Its totient is φ = 126720.
The previous prime is 242201. The next prime is 242227. The reversal of 242205 is 502242.
It is not a de Polignac number, because 242205 - 22 = 242201 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is an Ulam number.
It is a Curzon number.
It is a nialpdrome in base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (242201) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 885 + ... + 1125.
It is an arithmetic number, because the mean of its divisors is an integer number (24684).
2242205 is an apocalyptic number.
242205 is the 402-nd pentagonal number.
It is an amenable number.
242205 is a deficient number, since it is larger than the sum of its proper divisors (152739).
242205 is a wasteful number, since it uses less digits than its factorization.
242205 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 316.
The product of its (nonzero) digits is 160, while the sum is 15.
The square root of 242205 is about 492.1432718223.
The cubic root of 242205 is about 62.3343882181.
Adding to 242205 its reverse (502242), we get a palindrome (744447).
The spelling of 242205 in words is "two hundred forty-two thousand, two hundred five".