168905442 has 16 divisors (see below), whose sum is σ = 338893920. Its totient is φ = 56121312.

The previous prime is 168905393. The next prime is 168905461. The reversal of 168905442 is 244509861.

168905442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 168905442.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 43092 + ... + 46847.

It is an arithmetic number, because the mean of its divisors is an integer number (21180870).

Almost surely, 2^168905442 is an apocalyptic number.

168905442 is an abundant number, since it is smaller than the sum of its proper divisors (169988478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168905442 is a wasteful number, since it uses less digits than its factorization.

168905442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90257.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 168905442 is about 12996.3626449865. The cubic root of 168905442 is about 552.7743477541.

The spelling of 168905442 in words is "one hundred sixty-eight million, nine hundred five thousand, four hundred forty-two".