1085989 has 2 divisors, whose sum is σ = 1085990. Its totient is φ = 1085988.

The previous prime is 1085971. The next prime is 1086031. The reversal of 1085989 is 9895801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085764 + 225 = 1042^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085989 - 2⁵ = 1085957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542994 + 542995.

It is an arithmetic number, because the mean of its divisors is an integer number (542995).

2^1085989 is an apocalyptic number.

It is an amenable number.

1085989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085989 is an equidigital number, since it uses as much as digits as its factorization.

1085989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 1085989 is about 1042.1079598583. The cubic root of 1085989 is about 102.7878563176.

The spelling of 1085989 in words is "one million, eighty-five thousand, nine hundred eighty-nine".