82405 has 4 divisors (see below), whose sum is σ = 98892. Its totient is φ = 65920.

The previous prime is 82393. The next prime is 82421. The reversal of 82405 is 50428.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31329 + 51076 = 177^2 + 226^2 .

It is not a de Polignac number, because 82405 - 2⁵ = 82373 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 8236 + ... + 8245.

It is an arithmetic number, because the mean of its divisors is an integer number (24723).

2⁸²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

82405 is a deficient number, since it is larger than the sum of its proper divisors (16487).

82405 is a wasteful number, since it uses less digits than its factorization.

82405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16486.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 82405 is about 287.0627109187. The cubic root of 82405 is about 43.5162224252.

The spelling of 82405 in words is "eighty-two thousand, four hundred five".