899855 has 8 divisors (see below), whose sum is σ = 1178064. Its totient is φ = 654400.

The previous prime is 899851. The next prime is 899863. The reversal of 899855 is 558998.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 899855 - 2² = 899851 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (899851) 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 7 ways as a sum of consecutive naturals, for example, 8126 + ... + 8235.

It is an arithmetic number, because the mean of its divisors is an integer number (147258).

2⁸⁹⁹⁸⁵⁵ is an apocalyptic number.

899855 is a deficient number, since it is larger than the sum of its proper divisors (278209).

899855 is a wasteful number, since it uses less digits than its factorization.

899855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16377.

The product of its digits is 129600, while the sum is 44.

The square root of 899855 is about 948.6068732620. The cubic root of 899855 is about 96.5437531465.

Subtracting from 899855 its sum of digits (44), we obtain a triangular number (899811 = T₁₃₄₁).

The spelling of 899855 in words is "eight hundred ninety-nine thousand, eight hundred fifty-five".