642205 has 16 divisors (see below), whose sum is σ = 823680. Its totient is φ = 479808.

The previous prime is 642199. The next prime is 642211. The reversal of 642205 is 502246.

It is an interprime number because it is at equal distance from previous prime (642199) and next prime (642211).

It is a cyclic number.

It is not a de Polignac number, because 642205 - 2³ = 642197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6184 + ... + 6286.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2⁶⁴²²⁰⁵ is an apocalyptic number.

It is an amenable number.

642205 is a deficient number, since it is larger than the sum of its proper divisors (181475).

642205 is a wasteful number, since it uses less digits than its factorization.

642205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 642205 is about 801.3769400226. The cubic root of 642205 is about 86.2762435018.

The spelling of 642205 in words is "six hundred forty-two thousand, two hundred five".