243420542 has 4 divisors (see below), whose sum is σ = 365130816. Its totient is φ = 121710270.

The previous prime is 243420511. The next prime is 243420547. The reversal of 243420542 is 245024342.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243420547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60855134 + ... + 60855137.

It is an arithmetic number, because the mean of its divisors is an integer number (91282704).

Almost surely, 2^243420542 is an apocalyptic number.

243420542 is a deficient number, since it is larger than the sum of its proper divisors (121710274).

243420542 is a wasteful number, since it uses less digits than its factorization.

243420542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121710273.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 243420542 is about 15601.9403280489. The cubic root of 243420542 is about 624.3849240624.

Adding to 243420542 its reverse (245024342), we get a palindrome (488444884).

The spelling of 243420542 in words is "two hundred forty-three million, four hundred twenty thousand, five hundred forty-two".