2081389 has 4 divisors (see below), whose sum is σ = 2090556. Its totient is φ = 2072224.

The previous prime is 2081383. The next prime is 2081407. The reversal of 2081389 is 9831802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 476100 + 1605289 = 690^2 + 1267^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081389 - 2⁹ = 2080877 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a cake number, because a cake can be divided into 2081389 parts by 232 planar cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2081389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081383) 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 3 ways as a sum of consecutive naturals, for example, 4234 + ... + 4699.

It is an arithmetic number, because the mean of its divisors is an integer number (522639).

2^2081389 is an apocalyptic number.

It is an amenable number.

2081389 is a deficient number, since it is larger than the sum of its proper divisors (9167).

2081389 is an equidigital number, since it uses as much as digits as its factorization.

2081389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9166.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 2081389 is about 1442.7019789270. The cubic root of 2081389 is about 127.6784940728.

It can be divided in two parts, 20813 and 89, that added together give a palindrome (20902).

The spelling of 2081389 in words is "two million, eighty-one thousand, three hundred eighty-nine".