1081889 has 8 divisors (see below), whose sum is σ = 1117800. Its totient is φ = 1046656.

The previous prime is 1081859. The next prime is 1081891. The reversal of 1081889 is 9881801.

It can be written as a sum of positive squares in 4 ways, for example, as 115600 + 966289 = 340^2 + 983^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1081889 - 2¹² = 1077793 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7187 + ... + 7335.

It is an arithmetic number, because the mean of its divisors is an integer number (139725).

2^1081889 is an apocalyptic number.

It is an amenable number.

1081889 is a deficient number, since it is larger than the sum of its proper divisors (35911).

1081889 is a wasteful number, since it uses less digits than its factorization.

1081889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1081889 is about 1040.1389330277. The cubic root of 1081889 is about 102.6583394513.

The spelling of 1081889 in words is "one million, eighty-one thousand, eight hundred eighty-nine".