1872589 has 2 divisors, whose sum is σ = 1872590. Its totient is φ = 1872588.

The previous prime is 1872587. The next prime is 1872623. The reversal of 1872589 is 9852781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1755625 + 116964 = 1325^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872589 - 2¹ = 1872587 is a prime.

Together with 1872587, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872581) 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, 936294 + 936295.

It is an arithmetic number, because the mean of its divisors is an integer number (936295).

2^1872589 is an apocalyptic number.

It is an amenable number.

1872589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872589 is an equidigital number, since it uses as much as digits as its factorization.

1872589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 1872589 is about 1368.4257378462. The cubic root of 1872589 is about 123.2577273811.

The spelling of 1872589 in words is "one million, eight hundred seventy-two thousand, five hundred eighty-nine".