845489 has 2 divisors, whose sum is σ = 845490. Its totient is φ = 845488.

The previous prime is 845459. The next prime is 845491. The reversal of 845489 is 984548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824464 + 21025 = 908^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845489 is a prime.

Together with 845491, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (845459) 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, 422744 + 422745.

It is an arithmetic number, because the mean of its divisors is an integer number (422745).

2⁸⁴⁵⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

845489 is a deficient number, since it is larger than the sum of its proper divisors (1).

845489 is an equidigital number, since it uses as much as digits as its factorization.

845489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 38.

The square root of 845489 is about 919.5047580084. The cubic root of 845489 is about 94.5589527919.

The spelling of 845489 in words is "eight hundred forty-five thousand, four hundred eighty-nine".