168421938 has 8 divisors (see below), whose sum is σ = 336843888. Its totient is φ = 56140644.

The previous prime is 168421933. The next prime is 168421951. The reversal of 168421938 is 839124861.

168421938 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

168421938 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 168421938.

It is not an unprimeable number, because it can be changed into a prime (168421933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14035156 + ... + 14035167.

It is an arithmetic number, because the mean of its divisors is an integer number (42105486).

Almost surely, 2^168421938 is an apocalyptic number.

168421938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

168421938 is a wasteful number, since it uses less digits than its factorization.

168421938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28070328.

The product of its digits is 82944, while the sum is 42.

The square root of 168421938 is about 12977.7478015255. The cubic root of 168421938 is about 552.2463915267.

The spelling of 168421938 in words is "one hundred sixty-eight million, four hundred twenty-one thousand, nine hundred thirty-eight".