3645841 has 4 divisors (see below), whose sum is σ = 3730672. Its totient is φ = 3561012.

The previous prime is 3645823. The next prime is 3645877. The reversal of 3645841 is 1485463.

It is a happy number.

3645841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1485463 = 7 ⋅212209.

It is a cyclic number.

It is not a de Polignac number, because 3645841 - 2⁵ = 3645809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643841) 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 3 ways as a sum of consecutive naturals, for example, 42351 + ... + 42436.

It is an arithmetic number, because the mean of its divisors is an integer number (932668).

Almost surely, 2^3645841 is an apocalyptic number.

It is an amenable number.

3645841 is a deficient number, since it is larger than the sum of its proper divisors (84831).

3645841 is an equidigital number, since it uses as much as digits as its factorization.

3645841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84830.

The product of its digits is 11520, while the sum is 31.

The square root of 3645841 is about 1909.4085471685. The cubic root of 3645841 is about 153.9096704205.

The spelling of 3645841 in words is "three million, six hundred forty-five thousand, eight hundred forty-one".