1855589 has 2 divisors, whose sum is σ = 1855590. Its totient is φ = 1855588.

The previous prime is 1855577. The next prime is 1855591. The reversal of 1855589 is 9855581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 667489 = 1090^2 + 817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855589 - 2¹⁶ = 1790053 is a prime.

Together with 1855591, 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 (1855519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927794 + 927795.

It is an arithmetic number, because the mean of its divisors is an integer number (927795).

2^1855589 is an apocalyptic number.

It is an amenable number.

1855589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855589 is an equidigital number, since it uses as much as digits as its factorization.

1855589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 41.

The square root of 1855589 is about 1362.2000587285. The cubic root of 1855589 is about 122.8836010775.

The spelling of 1855589 in words is "one million, eight hundred fifty-five thousand, five hundred eighty-nine".