163444986 has 96 divisors (see below), whose sum is σ = 388814400. Its totient is φ = 50863680.

The previous prime is 163444949. The next prime is 163444997. The reversal of 163444986 is 689444361.

163444986 is a `hidden beast` number, since 1 + 634 + 4 + 4 + 9 + 8 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2679396 + ... + 2679456.

It is an arithmetic number, because the mean of its divisors is an integer number (4050150).

Almost surely, 2^163444986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163444986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194407200).

163444986 is an abundant number, since it is smaller than the sum of its proper divisors (225369414).

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

163444986 is a wasteful number, since it uses less digits than its factorization.

163444986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 154 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 163444986 is about 12784.5604539225. The cubic root of 163444986 is about 546.7521935555.

The spelling of 163444986 in words is "one hundred sixty-three million, four hundred forty-four thousand, nine hundred eighty-six".