242643542 has 4 divisors (see below), whose sum is σ = 363965316. Its totient is φ = 121321770.

The previous prime is 242643517. The next prime is 242643581. The reversal of 242643542 is 245346242.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245346242 = 2 ⋅122673121.

It is a junction number, because it is equal to n+sod(n) for n = 242643499 and 242643508.

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, 60660884 + ... + 60660887.

It is an arithmetic number, because the mean of its divisors is an integer number (90991329).

Almost surely, 2^242643542 is an apocalyptic number.

242643542 is a deficient number, since it is larger than the sum of its proper divisors (121321774).

242643542 is a wasteful number, since it uses less digits than its factorization.

242643542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121321773.

The product of its digits is 46080, while the sum is 32.

The square root of 242643542 is about 15577.0196764336. The cubic root of 242643542 is about 623.7198689868.

Adding to 242643542 its reverse (245346242), we get a palindrome (487989784).

The spelling of 242643542 in words is "two hundred forty-two million, six hundred forty-three thousand, five hundred forty-two".