168189542 has 4 divisors (see below), whose sum is σ = 252284316. Its totient is φ = 84094770.

The previous prime is 168189523. The next prime is 168189569. The reversal of 168189542 is 245981861.

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

It is a junction number, because it is equal to n+sod(n) for n = 168189493 and 168189502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42047384 + ... + 42047387.

It is an arithmetic number, because the mean of its divisors is an integer number (63071079).

Almost surely, 2^168189542 is an apocalyptic number.

168189542 is a deficient number, since it is larger than the sum of its proper divisors (84094774).

168189542 is an equidigital number, since it uses as much as digits as its factorization.

168189542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84094773.

The product of its digits is 138240, while the sum is 44.

The square root of 168189542 is about 12968.7910770434. The cubic root of 168189542 is about 551.9922699856.

The spelling of 168189542 in words is "one hundred sixty-eight million, one hundred eighty-nine thousand, five hundred forty-two".