682405 has 4 divisors (see below), whose sum is σ = 818892. Its totient is φ = 545920.

The previous prime is 682373. The next prime is 682411. The reversal of 682405 is 504286.

682405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504286 = 2 ⋅252143.

It can be written as a sum of positive squares in 2 ways, for example, as 101761 + 580644 = 319^2 + 762^2 .

It is not a de Polignac number, because 682405 - 2⁵ = 682373 is a prime.

It is a Duffinian number.

682405 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 682405.

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, 68236 + ... + 68245.

It is an arithmetic number, because the mean of its divisors is an integer number (204723).

2⁶⁸²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

682405 is a deficient number, since it is larger than the sum of its proper divisors (136487).

682405 is a wasteful number, since it uses less digits than its factorization.

682405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136486.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 682405 is about 826.0780834764. The cubic root of 682405 is about 88.0401418102.

The spelling of 682405 in words is "six hundred eighty-two thousand, four hundred five".