163989690 has 32 divisors (see below), whose sum is σ = 406273536. Its totient is φ = 42319680.

The previous prime is 163989677. The next prime is 163989691. The reversal of 163989690 is 96989361.

163989690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×163989690² = 53785236852592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163989691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87237 + ... + 89096.

It is an arithmetic number, because the mean of its divisors is an integer number (12696048).

Almost surely, 2^163989690 is an apocalyptic number.

163989690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163989690 is an abundant number, since it is smaller than the sum of its proper divisors (242283846).

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

163989690 is a wasteful number, since it uses less digits than its factorization.

163989690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176374.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 163989690 is about 12805.8459306678. The cubic root of 163989690 is about 547.3588969377.

The spelling of 163989690 in words is "one hundred sixty-three million, nine hundred eighty-nine thousand, six hundred ninety".