242089 has 4 divisors (see below), whose sum is σ = 244420. Its totient is φ = 239760.

The previous prime is 242083. The next prime is 242093. The reversal of 242089 is 980242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980242 = 2 ⋅490121.

It can be written as a sum of positive squares in 2 ways, for example, as 166464 + 75625 = 408^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 242089 - 2⁵ = 242057 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (242083) 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, 1002 + ... + 1219.

It is an arithmetic number, because the mean of its divisors is an integer number (61105).

2²⁴²⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

242089 is a deficient number, since it is larger than the sum of its proper divisors (2331).

242089 is a wasteful number, since it uses less digits than its factorization.

242089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 242089 is about 492.0254058481. The cubic root of 242089 is about 62.3244352943.

Subtracting from 242089 its sum of digits (25), we obtain a square (242064 = 492²).

The spelling of 242089 in words is "two hundred forty-two thousand, eighty-nine".