899959 has 4 divisors (see below), whose sum is σ = 904816. Its totient is φ = 895104.

The previous prime is 899939. The next prime is 899971. The reversal of 899959 is 959998.

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

It is a cyclic number.

It is not a de Polignac number, because 899959 - 2⁷ = 899831 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899939) 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, 2139 + ... + 2524.

It is an arithmetic number, because the mean of its divisors is an integer number (226204).

2⁸⁹⁹⁹⁵⁹ is an apocalyptic number.

899959 is a deficient number, since it is larger than the sum of its proper divisors (4857).

899959 is a wasteful number, since it uses less digits than its factorization.

899959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4856.

The product of its digits is 262440, while the sum is 49.

The square root of 899959 is about 948.6616889071. The cubic root of 899959 is about 96.5474723248.

The spelling of 899959 in words is "eight hundred ninety-nine thousand, nine hundred fifty-nine".