999955 has 8 divisors (see below), whose sum is σ = 1309104. Its totient is φ = 727200.

The previous prime is 999953. The next prime is 999959. The reversal of 999955 is 559999.

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

It is not a de Polignac number, because 999955 - 2¹ = 999953 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9036 + ... + 9145.

It is an arithmetic number, because the mean of its divisors is an integer number (163638).

2⁹⁹⁹⁹⁵⁵ is an apocalyptic number.

999955 is a deficient number, since it is larger than the sum of its proper divisors (309149).

999955 is a wasteful number, since it uses less digits than its factorization.

999955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18197.

The product of its digits is 164025, while the sum is 46.

The square root of 999955 is about 999.9774997469. The cubic root of 999955 is about 99.9984999775.

Adding to 999955 its sum of digits (46), we get a palindrome (1000001).

It can be divided in two parts, 99995 and 5, that added together give a 5-th power (100000 = 10⁵).

The spelling of 999955 in words is "nine hundred ninety-nine thousand, nine hundred fifty-five".