3405205 has 4 divisors (see below), whose sum is σ = 4086252. Its totient is φ = 2724160.

The previous prime is 3405191. The next prime is 3405217. The reversal of 3405205 is 5025043.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5025043 = 2203 ⋅2281.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 2829124 = 759^2 + 1682^2 .

It is not a de Polignac number, because 3405205 - 2¹¹ = 3403157 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, 340516 + ... + 340525.

It is an arithmetic number, because the mean of its divisors is an integer number (1021563).

Almost surely, 2^3405205 is an apocalyptic number.

It is an amenable number.

3405205 is a deficient number, since it is larger than the sum of its proper divisors (681047).

3405205 is an equidigital number, since it uses as much as digits as its factorization.

3405205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681046.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 3405205 is about 1845.3197554895. The cubic root of 3405205 is about 150.4461531483.

The spelling of 3405205 in words is "three million, four hundred five thousand, two hundred five".