4205405 has 4 divisors (see below), whose sum is σ = 5046492. Its totient is φ = 3364320.

The previous prime is 4205393. The next prime is 4205437. The reversal of 4205405 is 5045024.

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 3193369 + 1012036 = 1787^2 + 1006^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4205405 is a prime.

It is a Duffinian number.

It is a Curzon 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, 420536 + ... + 420545.

It is an arithmetic number, because the mean of its divisors is an integer number (1261623).

Almost surely, 2^4205405 is an apocalyptic number.

It is an amenable number.

4205405 is a deficient number, since it is larger than the sum of its proper divisors (841087).

4205405 is an equidigital number, since it uses as much as digits as its factorization.

4205405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841086.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 4205405 is about 2050.7084141828. The cubic root of 4205405 is about 161.4120459013.

It can be divided in two parts, 4205 and 405, that multiplied together give a square (1703025 = 1305²).

The spelling of 4205405 in words is "four million, two hundred five thousand, four hundred five".