8720189 has 2 divisors, whose sum is σ = 8720190. Its totient is φ = 8720188.

The previous prime is 8720177. The next prime is 8720191. The reversal of 8720189 is 9810278.

It is a happy number.

8720189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8702500 + 17689 = 2950^2 + 133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8720189 is a prime.

It is a super-3 number, since 3×8720189³ (a number of 22 digits) contains 333 as substring.

Together with 8720191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8720119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360094 + 4360095.

It is an arithmetic number, because the mean of its divisors is an integer number (4360095).

Almost surely, 2^8720189 is an apocalyptic number.

It is an amenable number.

8720189 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720189 is an equidigital number, since it uses as much as digits as its factorization.

8720189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8720189 is about 2952.9966136113. The cubic root of 8720189 is about 205.8299803672.

The spelling of 8720189 in words is "eight million, seven hundred twenty thousand, one hundred eighty-nine".