242457 has 4 divisors (see below), whose sum is σ = 323280. Its totient is φ = 161636.

The previous prime is 242453. The next prime is 242467. The reversal of 242457 is 754242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 242457 - 2² = 242453 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (242453) 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, 40407 + ... + 40412.

It is an arithmetic number, because the mean of its divisors is an integer number (80820).

2²⁴²⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

242457 is a deficient number, since it is larger than the sum of its proper divisors (80823).

242457 is an equidigital number, since it uses as much as digits as its factorization.

242457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80822.

The product of its digits is 2240, while the sum is 24.

The square root of 242457 is about 492.3992282691. The cubic root of 242457 is about 62.3559991415.

Adding to 242457 its reverse (754242), we get a palindrome (996699).

The spelling of 242457 in words is "two hundred forty-two thousand, four hundred fifty-seven".