671205 has 16 divisors (see below), whose sum is σ = 1111680. Its totient is φ = 345408.

The previous prime is 671201. The next prime is 671219. The reversal of 671205 is 502176.

It is not a de Polignac number, because 671205 - 2² = 671201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337 + ... + 1206.

It is an arithmetic number, because the mean of its divisors is an integer number (69480).

2⁶⁷¹²⁰⁵ is an apocalyptic number.

It is an amenable number.

671205 is a deficient number, since it is larger than the sum of its proper divisors (440475).

671205 is a wasteful number, since it uses less digits than its factorization.

671205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 671205 is about 819.2710174295. The cubic root of 671205 is about 87.5558283174. Note that the first 3 decimals are identical.

The spelling of 671205 in words is "six hundred seventy-one thousand, two hundred five".