168398406 has 128 divisors (see below), whose sum is σ = 440985600. Its totient is φ = 47083680.

The previous prime is 168398393. The next prime is 168398423. The reversal of 168398406 is 604893861.

168398406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 485125 + ... + 485471.

It is an arithmetic number, because the mean of its divisors is an integer number (3445200).

Almost surely, 2^168398406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168398406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220492800).

168398406 is an abundant number, since it is smaller than the sum of its proper divisors (272587194).

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

168398406 is a wasteful number, since it uses less digits than its factorization.

168398406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 168398406 is about 12976.8411410482. The cubic root of 168398406 is about 552.2206702786.

The spelling of 168398406 in words is "one hundred sixty-eight million, three hundred ninety-eight thousand, four hundred six".