242542 has 4 divisors (see below), whose sum is σ = 363816. Its totient is φ = 121270.

The previous prime is 242533. The next prime is 242551. The reversal of 242542 is 245242.

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

It is an interprime number because it is at equal distance from previous prime (242533) and next prime (242551).

It is an Ulam number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60634 + ... + 60637.

It is an arithmetic number, because the mean of its divisors is an integer number (90954).

2²⁴²⁵⁴² is an apocalyptic number.

242542 is a deficient number, since it is larger than the sum of its proper divisors (121274).

242542 is a wasteful number, since it uses less digits than its factorization.

242542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121273.

The product of its digits is 640, while the sum is 19.

The square root of 242542 is about 492.4855327824. The cubic root of 242542 is about 62.3632851629.

Adding to 242542 its reverse (245242), we get a palindrome (487784).

It can be divided in two parts, 242 and 542, that added together give a square (784 = 28²).

The spelling of 242542 in words is "two hundred forty-two thousand, five hundred forty-two".