205215 has 8 divisors (see below), whose sum is σ = 328368. Its totient is φ = 109440.

The previous prime is 205213. The next prime is 205223. The reversal of 205215 is 512502.

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

It is not a de Polignac number, because 205215 - 2¹ = 205213 is a prime.

It is a super-2 number, since 2×205215² = 84226392450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 13681 = 205215 / (2 + 0 + 5 + 2 + 1 + 5).

It is a junction number, because it is equal to n+sod(n) for n = 205194 and 205203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205211) 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, 6826 + ... + 6855.

It is an arithmetic number, because the mean of its divisors is an integer number (41046).

2²⁰⁵²¹⁵ is an apocalyptic number.

205215 is a deficient number, since it is larger than the sum of its proper divisors (123153).

205215 is a wasteful number, since it uses less digits than its factorization.

205215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13689.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 205215 is about 453.0066224681. The cubic root of 205215 is about 58.9842915185.

Adding to 205215 its reverse (512502), we get a palindrome (717717).

The spelling of 205215 in words is "two hundred five thousand, two hundred fifteen".