845989 has 2 divisors, whose sum is σ = 845990. Its totient is φ = 845988.

The previous prime is 845987. The next prime is 846037. The reversal of 845989 is 989548.

It is a happy number.

845989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 693889 + 152100 = 833^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 845989 - 2¹ = 845987 is a prime.

Together with 845987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422994 + 422995.

It is an arithmetic number, because the mean of its divisors is an integer number (422995).

2⁸⁴⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

845989 is a deficient number, since it is larger than the sum of its proper divisors (1).

845989 is an equidigital number, since it uses as much as digits as its factorization.

845989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 845989 is about 919.7766033119. The cubic root of 845989 is about 94.5775890129.

The spelling of 845989 in words is "eight hundred forty-five thousand, nine hundred eighty-nine".