168799989 has 4 divisors (see below), whose sum is σ = 225066656. Its totient is φ = 112533324.

The previous prime is 168799979. The next prime is 168799999. The reversal of 168799989 is 989997861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989997861 = 3 ⋅329999287.

It is an interprime number because it is at equal distance from previous prime (168799979) and next prime (168799999).

It is not a de Polignac number, because 168799989 - 2⁷ = 168799861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168799979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28133329 + ... + 28133334.

It is an arithmetic number, because the mean of its divisors is an integer number (56266664).

Almost surely, 2^168799989 is an apocalyptic number.

It is an amenable number.

168799989 is a deficient number, since it is larger than the sum of its proper divisors (56266667).

168799989 is an equidigital number, since it uses as much as digits as its factorization.

168799989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56266666.

The product of its digits is 17635968, while the sum is 66.

The square root of 168799989 is about 12992.3049918019. The cubic root of 168799989 is about 552.6592856461.

The spelling of 168799989 in words is "one hundred sixty-eight million, seven hundred ninety-nine thousand, nine hundred eighty-nine".