163921938 has 32 divisors (see below), whose sum is σ = 333802752. Its totient is φ = 53654400.

The previous prime is 163921931. The next prime is 163921957. The reversal of 163921938 is 839129361.

163921938 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 163921938.

It is not an unprimeable number, because it can be changed into a prime (163921931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118008 + ... + 119388.

It is an arithmetic number, because the mean of its divisors is an integer number (10431336).

Almost surely, 2^163921938 is an apocalyptic number.

163921938 is an abundant number, since it is smaller than the sum of its proper divisors (169880814).

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

163921938 is a wasteful number, since it uses less digits than its factorization.

163921938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its digits is 69984, while the sum is 42.

The square root of 163921938 is about 12803.2003030492. The cubic root of 163921938 is about 547.2835064902.

The spelling of 163921938 in words is "one hundred sixty-three million, nine hundred twenty-one thousand, nine hundred thirty-eight".