3420805 has 8 divisors (see below), whose sum is σ = 4114944. Its totient is φ = 2730000.

The previous prime is 3420799. The next prime is 3420821. The reversal of 3420805 is 5080243.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3420805 - 2⁵ = 3420773 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3300 + ... + 4210.

It is an arithmetic number, because the mean of its divisors is an integer number (514368).

Almost surely, 2^3420805 is an apocalyptic number.

It is an amenable number.

3420805 is a deficient number, since it is larger than the sum of its proper divisors (694139).

3420805 is an equidigital number, since it uses as much as digits as its factorization.

3420805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 3420805 is about 1849.5418351581. The cubic root of 3420805 is about 150.6755456128.

It can be divided in two parts, 3420 and 805, that added together give a square (4225 = 65²).

The spelling of 3420805 in words is "three million, four hundred twenty thousand, eight hundred five".