1906589 has 2 divisors, whose sum is σ = 1906590. Its totient is φ = 1906588.

The previous prime is 1906579. The next prime is 1906603. The reversal of 1906589 is 9856091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 105625 = 1342^2 + 325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1906589 is a prime.

It is a super-3 number, since 3×1906589³ = 20791819863331843407, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1906559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953294 + 953295.

It is an arithmetic number, because the mean of its divisors is an integer number (953295).

2^1906589 is an apocalyptic number.

It is an amenable number.

1906589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906589 is an equidigital number, since it uses as much as digits as its factorization.

1906589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1906589 is about 1380.7928881624. The cubic root of 1906589 is about 123.9992412371. Note that the first 3 decimals are identical.

The spelling of 1906589 in words is "one million, nine hundred six thousand, five hundred eighty-nine".