1865489 has 2 divisors, whose sum is σ = 1865490. Its totient is φ = 1865488.

The previous prime is 1865471. The next prime is 1865491. The reversal of 1865489 is 9845681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1481089 + 384400 = 1217^2 + 620^2 .

It is an emirp because it is prime and its reverse (9845681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1865489 - 2⁸ = 1865233 is a prime.

Together with 1865491, 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 (1865419) 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, 932744 + 932745.

It is an arithmetic number, because the mean of its divisors is an integer number (932745).

2^1865489 is an apocalyptic number.

It is an amenable number.

1865489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865489 is an equidigital number, since it uses as much as digits as its factorization.

1865489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 41.

The square root of 1865489 is about 1365.8290522609. The cubic root of 1865489 is about 123.1017511310.

The spelling of 1865489 in words is "one million, eight hundred sixty-five thousand, four hundred eighty-nine".