242539 has 8 divisors (see below), whose sum is σ = 280368. Its totient is φ = 207360.

The previous prime is 242533. The next prime is 242551. The reversal of 242539 is 935242.

It is a happy number.

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 242539 - 2¹¹ = 240491 is a prime.

242539 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (242533) 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, 462 + ... + 835.

It is an arithmetic number, because the mean of its divisors is an integer number (35046).

2²⁴²⁵³⁹ is an apocalyptic number.

242539 is a deficient number, since it is larger than the sum of its proper divisors (37829).

242539 is a wasteful number, since it uses less digits than its factorization.

242539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325.

The product of its digits is 2160, while the sum is 25.

The square root of 242539 is about 492.4824869983. The cubic root of 242539 is about 62.3630280382.

It can be divided in two parts, 2 and 42539, that multiplied together give a triangular number (85078 = T₄₁₂).

The spelling of 242539 in words is "two hundred forty-two thousand, five hundred thirty-nine".