242705 has 4 divisors (see below), whose sum is σ = 291252. Its totient is φ = 194160.

The previous prime is 242689. The next prime is 242713. The reversal of 242705 is 507242.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 208849 = 184^2 + 457^2 .

It is not a de Polignac number, because 242705 - 2⁴ = 242689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24266 + ... + 24275.

It is an arithmetic number, because the mean of its divisors is an integer number (72813).

2²⁴²⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

242705 is a deficient number, since it is larger than the sum of its proper divisors (48547).

242705 is an equidigital number, since it uses as much as digits as its factorization.

242705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48546.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 242705 is about 492.6509920826. The cubic root of 242705 is about 62.3772524197.

Adding to 242705 its reverse (507242), we get a palindrome (749947).

The spelling of 242705 in words is "two hundred forty-two thousand, seven hundred five".