840089 has 4 divisors (see below), whose sum is σ = 889524. Its totient is φ = 790656.

The previous prime is 840083. The next prime is 840109. The reversal of 840089 is 980048.

840089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 739600 + 100489 = 860^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 840089 - 2¹² = 835993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (840083) 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, 24692 + ... + 24725.

It is an arithmetic number, because the mean of its divisors is an integer number (222381).

2⁸⁴⁰⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

840089 is a deficient number, since it is larger than the sum of its proper divisors (49435).

840089 is a wasteful number, since it uses less digits than its factorization.

840089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49434.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 840089 is about 916.5636911857. The cubic root of 840089 is about 94.3572118280.

The spelling of 840089 in words is "eight hundred forty thousand, eighty-nine".