163989856 has 12 divisors (see below), whose sum is σ = 322855092. Its totient is φ = 81994912.

The previous prime is 163989821. The next prime is 163989857. The reversal of 163989856 is 658989361.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 163989797 and 163989806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163989857) by changing a digit.

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 as a sum of consecutive naturals, namely, 2562310 + ... + 2562373.

It is an arithmetic number, because the mean of its divisors is an integer number (26904591).

Almost surely, 2^163989856 is an apocalyptic number.

163989856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

163989856 is a deficient number, since it is larger than the sum of its proper divisors (158865236).

163989856 is an equidigital number, since it uses as much as digits as its factorization.

163989856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124693 (or 5124685 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The square root of 163989856 is about 12805.8524120810. The cubic root of 163989856 is about 547.3590816272.

The spelling of 163989856 in words is "one hundred sixty-three million, nine hundred eighty-nine thousand, eight hundred fifty-six".