899955 has 24 divisors (see below), whose sum is σ = 1783392. Its totient is φ = 411264.

The previous prime is 899939. The next prime is 899971. The reversal of 899955 is 559998.

It is an interprime number because it is at equal distance from previous prime (899939) and next prime (899971).

It is not a de Polignac number, because 899955 - 2⁴ = 899939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

899955 is a lucky number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 899955.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1114 + ... + 1743.

It is an arithmetic number, because the mean of its divisors is an integer number (74308).

899955 is a Friedman number, since it can be written as 9*((9+9-8)^5-5), using all its digits and the basic arithmetic operations.

2⁸⁹⁹⁹⁵⁵ is an apocalyptic number.

899955 is a deficient number, since it is larger than the sum of its proper divisors (883437).

899955 is a wasteful number, since it uses less digits than its factorization.

899955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875 (or 2872 counting only the distinct ones).

The product of its digits is 145800, while the sum is 45.

The square root of 899955 is about 948.6595806716. The cubic root of 899955 is about 96.5473292848.

It can be divided in two parts, 89995 and 5, that added together give a square (90000 = 300²).

The spelling of 899955 in words is "eight hundred ninety-nine thousand, nine hundred fifty-five".