168391806 has 64 divisors (see below), whose sum is σ = 384410880. Its totient is φ = 48706560.

The previous prime is 168391793. The next prime is 168391807. The reversal of 168391806 is 608193861.

168391806 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168391807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185205 + ... + 186111.

It is an arithmetic number, because the mean of its divisors is an integer number (6006420).

Almost surely, 2^168391806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168391806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192205440).

168391806 is an abundant number, since it is smaller than the sum of its proper divisors (216019074).

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

168391806 is a wasteful number, since it uses less digits than its factorization.

168391806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 168391806 is about 12976.5868393811. The cubic root of 168391806 is about 552.2134558318.

The spelling of 168391806 in words is "one hundred sixty-eight million, three hundred ninety-one thousand, eight hundred six".