168218242 has 4 divisors (see below), whose sum is σ = 252327366. Its totient is φ = 84109120.

The previous prime is 168218233. The next prime is 168218249. The reversal of 168218242 is 242812861.

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

It can be written as a sum of positive squares in only one way, i.e., 159744321 + 8473921 = 12639^2 + 2911^2 .

It is a junction number, because it is equal to n+sod(n) for n = 168218198 and 168218207.

It is not an unprimeable number, because it can be changed into a prime (168218249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42054559 + ... + 42054562.

Almost surely, 2^168218242 is an apocalyptic number.

168218242 is a deficient number, since it is larger than the sum of its proper divisors (84109124).

168218242 is an equidigital number, since it uses as much as digits as its factorization.

168218242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84109123.

The product of its digits is 12288, while the sum is 34.

The square root of 168218242 is about 12969.8975323632. The cubic root of 168218242 is about 552.0236656695.

The spelling of 168218242 in words is "one hundred sixty-eight million, two hundred eighteen thousand, two hundred forty-two".