209995 has 4 divisors (see below), whose sum is σ = 252000. Its totient is φ = 167992.

The previous prime is 209987. The next prime is 210011. The reversal of 209995 is 599902.

209995 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 599902 = 2 ⋅299951.

It is a cyclic number.

It is not a de Polignac number, because 209995 - 2³ = 209987 is a prime.

209995 is a lucky number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 209995.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20995 + ... + 21004.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2²⁰⁹⁹⁹⁵ is an apocalyptic number.

209995 is a deficient number, since it is larger than the sum of its proper divisors (42005).

209995 is an equidigital number, since it uses as much as digits as its factorization.

209995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42004.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 209995 is about 458.2521140159. The cubic root of 209995 is about 59.4387477840.

The spelling of 209995 in words is "two hundred nine thousand, nine hundred ninety-five".