3405685 has 4 divisors (see below), whose sum is σ = 4086828. Its totient is φ = 2724544.

The previous prime is 3405671. The next prime is 3405697. The reversal of 3405685 is 5865043.

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 1615441 + 1790244 = 1271^2 + 1338^2 .

It is a cyclic number.

It is not a de Polignac number, because 3405685 - 2⁵ = 3405653 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3405685 is a lucky 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, 340564 + ... + 340573.

It is an arithmetic number, because the mean of its divisors is an integer number (1021707).

Almost surely, 2^3405685 is an apocalyptic number.

It is an amenable number.

3405685 is a deficient number, since it is larger than the sum of its proper divisors (681143).

3405685 is an equidigital number, since it uses as much as digits as its factorization.

3405685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681142.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 3405685 is about 1845.4498096670. The cubic root of 3405685 is about 150.4532218133.

The spelling of 3405685 in words is "three million, four hundred five thousand, six hundred eighty-five".