2089861 has 8 divisors (see below), whose sum is σ = 2225880. Its totient is φ = 1955328.

The previous prime is 2089859. The next prime is 2089873. The reversal of 2089861 is 1689802.

It can be written as a sum of positive squares in 4 ways, for example, as 448900 + 1640961 = 670^2 + 1281^2 .

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 2089861 - 2¹ = 2089859 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 (2089831) 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 in 7 ways as a sum of consecutive naturals, for example, 4345 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (278235).

2^2089861 is an apocalyptic number.

It is an amenable number.

2089861 is a deficient number, since it is larger than the sum of its proper divisors (136019).

2089861 is a wasteful number, since it uses less digits than its factorization.

2089861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2089861 is about 1445.6351545255. The cubic root of 2089861 is about 127.8514919901.

The spelling of 2089861 in words is "two million, eighty-nine thousand, eight hundred sixty-one".