3445821 has 20 divisors (see below), whose sum is σ = 5420800. Its totient is φ = 2175336.

The previous prime is 3445811. The next prime is 3445823. The reversal of 3445821 is 1285443.

3445821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3445821 - 2⁵ = 3445789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3445823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 420 + ... + 2658.

It is an arithmetic number, because the mean of its divisors is an integer number (271040).

Almost surely, 2^3445821 is an apocalyptic number.

It is an amenable number.

3445821 is a deficient number, since it is larger than the sum of its proper divisors (1974979).

3445821 is a wasteful number, since it uses less digits than its factorization.

3445821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270 (or 2261 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 3445821 is about 1856.2922722459. The cubic root of 3445821 is about 151.0419455712.

The spelling of 3445821 in words is "three million, four hundred forty-five thousand, eight hundred twenty-one".