819089 has 4 divisors (see below), whose sum is σ = 822324. Its totient is φ = 815856.

The previous prime is 819083. The next prime is 819101. The reversal of 819089 is 980918.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 980918 = 2 ⋅490459.

It can be written as a sum of positive squares in 2 ways, for example, as 146689 + 672400 = 383^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 819089 - 2⁴ = 819073 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 (819083) 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, 1202 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (205581).

2⁸¹⁹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

819089 is a deficient number, since it is larger than the sum of its proper divisors (3235).

819089 is a wasteful number, since it uses less digits than its factorization.

819089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 819089 is about 905.0353584253. The cubic root of 819089 is about 93.5643413125.

The spelling of 819089 in words is "eight hundred nineteen thousand, eighty-nine".