209055 has 32 divisors (see below), whose sum is σ = 419328. Its totient is φ = 86400.

The previous prime is 209039. The next prime is 209063. The reversal of 209055 is 550902.

It is not a de Polignac number, because 209055 - 2⁴ = 209039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

209055 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1065 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (13104).

2²⁰⁹⁰⁵⁵ is an apocalyptic number.

209055 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209055 is a wasteful number, since it uses less digits than its factorization.

209055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 209055 is about 457.2253273825. The cubic root of 209055 is about 59.3499266247.

Adding to 209055 its reverse (550902), we get a palindrome (759957).

It can be divided in two parts, 20905 and 5, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 209055 in words is "two hundred nine thousand, fifty-five".