899905 has 4 divisors (see below), whose sum is σ = 1079892. Its totient is φ = 719920.

The previous prime is 899903. The next prime is 899917. The reversal of 899905 is 509998.

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 505521 + 394384 = 711^2 + 628^2 .

It is not a de Polignac number, because 899905 - 2¹ = 899903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (899903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89986 + ... + 89995.

It is an arithmetic number, because the mean of its divisors is an integer number (269973).

2⁸⁹⁹⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

899905 is a deficient number, since it is larger than the sum of its proper divisors (179987).

899905 is a wasteful number, since it uses less digits than its factorization.

899905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179986.

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

The square root of 899905 is about 948.6332273329. The cubic root of 899905 is about 96.5455412487.

The spelling of 899905 in words is "eight hundred ninety-nine thousand, nine hundred five".