168720189 has 16 divisors (see below), whose sum is σ = 259848000. Its totient is φ = 96239360.

The previous prime is 168720179. The next prime is 168720191. The reversal of 168720189 is 981027861.

It is a cyclic number.

It is not a de Polignac number, because 168720189 - 2¹⁷ = 168589117 is a prime.

It is a super-3 number, since 3×168720189³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 168720189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168720109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149814 + ... + 150935.

It is an arithmetic number, because the mean of its divisors is an integer number (16240500).

Almost surely, 2^168720189 is an apocalyptic number.

It is an amenable number.

168720189 is a deficient number, since it is larger than the sum of its proper divisors (91127811).

168720189 is a wasteful number, since it uses less digits than its factorization.

168720189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300780.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 168720189 is about 12989.2335801617. The cubic root of 168720189 is about 552.5721822388.

The spelling of 168720189 in words is "one hundred sixty-eight million, seven hundred twenty thousand, one hundred eighty-nine".