899789 has 4 divisors (see below), whose sum is σ = 981600. Its totient is φ = 817980.

The previous prime is 899779. The next prime is 899791. The reversal of 899789 is 987998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-899789 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899719) 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, 40889 + ... + 40910.

It is an arithmetic number, because the mean of its divisors is an integer number (245400).

2⁸⁹⁹⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

899789 is a deficient number, since it is larger than the sum of its proper divisors (81811).

899789 is a wasteful number, since it uses less digits than its factorization.

899789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81810.

The product of its digits is 326592, while the sum is 50.

The square root of 899789 is about 948.5720847674. The cubic root of 899789 is about 96.5413927501.

Subtracting 899789 from its reverse (987998), we obtain a square (88209 = 297²).

The spelling of 899789 in words is "eight hundred ninety-nine thousand, seven hundred eighty-nine".