242139 has 4 divisors (see below), whose sum is σ = 322856. Its totient is φ = 161424.

The previous prime is 242129. The next prime is 242147. The reversal of 242139 is 931242.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 242139 - 2⁸ = 241883 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 242139.

It is not an unprimeable number, because it can be changed into a prime (242119) 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, 40354 + ... + 40359.

It is an arithmetic number, because the mean of its divisors is an integer number (80714).

2²⁴²¹³⁹ is an apocalyptic number.

242139 is a deficient number, since it is larger than the sum of its proper divisors (80717).

242139 is an equidigital number, since it uses as much as digits as its factorization.

242139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80716.

The product of its digits is 432, while the sum is 21.

The square root of 242139 is about 492.0762136092. The cubic root of 242139 is about 62.3287257374.

The spelling of 242139 in words is "two hundred forty-two thousand, one hundred thirty-nine".