605405 has 4 divisors (see below), whose sum is σ = 726492. Its totient is φ = 484320.

The previous prime is 605401. The next prime is 605411. The reversal of 605405 is 504506.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504506 = 2 ⋅252253.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 395641 = 458^2 + 629^2 .

It is not a de Polignac number, because 605405 - 2² = 605401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60536 + ... + 60545.

It is an arithmetic number, because the mean of its divisors is an integer number (181623).

2⁶⁰⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

605405 is a deficient number, since it is larger than the sum of its proper divisors (121087).

605405 is a wasteful number, since it uses less digits than its factorization.

605405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121086.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 605405 is about 778.0777596102. The cubic root of 605405 is about 84.5957739041.

It can be divided in two parts, 605 and 405, that multiplied together give a square (245025 = 495²).

The spelling of 605405 in words is "six hundred five thousand, four hundred five".