2158489 has 4 divisors (see below), whose sum is σ = 2164324. Its totient is φ = 2152656.

The previous prime is 2158483. The next prime is 2158501. The reversal of 2158489 is 9848512.

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 1334025 + 824464 = 1155^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158489 - 2¹⁹ = 1634201 is a prime.

It is a Duffinian number.

2158489 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2158483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2322 + ... + 3115.

It is an arithmetic number, because the mean of its divisors is an integer number (541081).

2^2158489 is an apocalyptic number.

It is an amenable number.

2158489 is a deficient number, since it is larger than the sum of its proper divisors (5835).

2158489 is an equidigital number, since it uses as much as digits as its factorization.

2158489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834.

The product of its digits is 23040, while the sum is 37.

The square root of 2158489 is about 1469.1797030997. The cubic root of 2158489 is about 129.2359322335.

Adding to 2158489 its product of digits (23040), we get a square (2181529 = 1477²).

The spelling of 2158489 in words is "two million, one hundred fifty-eight thousand, four hundred eighty-nine".