242155 has 8 divisors (see below), whose sum is σ = 306000. Its totient is φ = 183456.

The previous prime is 242147. The next prime is 242161. The reversal of 242155 is 551242.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 242155 - 2³ = 242147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a d-powerful number, because it can be written as 2¹⁵ + 4³ + 1 + 2¹⁷ + 5³ + 5⁷ .

242155 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (38250).

2²⁴²¹⁵⁵ is an apocalyptic number.

242155 is a deficient number, since it is larger than the sum of its proper divisors (63845).

242155 is a wasteful number, since it uses less digits than its factorization.

242155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573.

The product of its digits is 400, while the sum is 19.

The square root of 242155 is about 492.0924709849. The cubic root of 242155 is about 62.3300985545.

Adding to 242155 its reverse (551242), we get a palindrome (793397).

The spelling of 242155 in words is "two hundred forty-two thousand, one hundred fifty-five".