1089859 has 6 divisors (see below), whose sum is σ = 1150620. Its totient is φ = 1032156.

The previous prime is 1089841. The next prime is 1089863. The reversal of 1089859 is 9589801.

It is not a de Polignac number, because 1089859 - 2¹¹ = 1087811 is a prime.

It is a Duffinian number.

1089859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1089259) 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 in 5 ways as a sum of consecutive naturals, for example, 1149 + ... + 1870.

It is an arithmetic number, because the mean of its divisors is an integer number (191770).

2^1089859 is an apocalyptic number.

1089859 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1089859 is a deficient number, since it is larger than the sum of its proper divisors (60761).

1089859 is an equidigital number, since it uses as much as digits as its factorization.

1089859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057 (or 3038 counting only the distinct ones).

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

The square root of 1089859 is about 1043.9631219540. The cubic root of 1089859 is about 102.9098088790.

The spelling of 1089859 in words is "one million, eighty-nine thousand, eight hundred fifty-nine".