163908385 has 4 divisors (see below), whose sum is σ = 196690068. Its totient is φ = 131126704.

The previous prime is 163908361. The next prime is 163908401. The reversal of 163908385 is 583809361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78216336 + 85692049 = 8844^2 + 9257^2 .

It is a cyclic number.

It is not a de Polignac number, because 163908385 - 2¹⁵ = 163875617 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 16390834 + ... + 16390843.

It is an arithmetic number, because the mean of its divisors is an integer number (49172517).

Almost surely, 2^163908385 is an apocalyptic number.

It is an amenable number.

163908385 is a deficient number, since it is larger than the sum of its proper divisors (32781683).

163908385 is an equidigital number, since it uses as much as digits as its factorization.

163908385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32781682.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 163908385 is about 12802.6710103790. The cubic root of 163908385 is about 547.2684230144.

The spelling of 163908385 in words is "one hundred sixty-three million, nine hundred eight thousand, three hundred eighty-five".