899845 has 4 divisors (see below), whose sum is σ = 1079820. Its totient is φ = 719872.

The previous prime is 899831. The next prime is 899849. The reversal of 899845 is 548998.

It is a happy number.

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 550564 + 349281 = 742^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 899845 - 2¹⁷ = 768773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899849) 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, 89980 + ... + 89989.

It is an arithmetic number, because the mean of its divisors is an integer number (269955).

2⁸⁹⁹⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

899845 is a deficient number, since it is larger than the sum of its proper divisors (179975).

899845 is a wasteful number, since it uses less digits than its factorization.

899845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179974.

The product of its digits is 103680, while the sum is 43.

The square root of 899845 is about 948.6016023600. The cubic root of 899845 is about 96.5433955181.

The spelling of 899845 in words is "eight hundred ninety-nine thousand, eight hundred forty-five".