899509 has 4 divisors (see below), whose sum is σ = 968716. Its totient is φ = 830304.

The previous prime is 899491. The next prime is 899519. The reversal of 899509 is 905998.

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 378225 + 521284 = 615^2 + 722^2 .

It is a cyclic number.

It is not a de Polignac number, because 899509 - 2⁵ = 899477 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 (899519) 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, 34584 + ... + 34609.

It is an arithmetic number, because the mean of its divisors is an integer number (242179).

2⁸⁹⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

899509 is a deficient number, since it is larger than the sum of its proper divisors (69207).

899509 is a wasteful number, since it uses less digits than its factorization.

899509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69206.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 899509 is about 948.4244830243. The cubic root of 899509 is about 96.5313776635.

The spelling of 899509 in words is "eight hundred ninety-nine thousand, five hundred nine".