3645641 has 4 divisors (see below), whose sum is σ = 3651732. Its totient is φ = 3639552.

The previous prime is 3645623. The next prime is 3645643. The reversal of 3645641 is 1465463.

It is a happy number.

3645641 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.

It can be written as a sum of positive squares in 2 ways, for example, as 687241 + 2958400 = 829^2 + 1720^2 .

It is a cyclic number.

It is not a de Polignac number, because 3645641 - 2¹⁰ = 3644617 is a prime.

It is a d-powerful number, because it can be written as 3 + 6⁵ + 4⁵ + 5⁹ + 6⁸ + 4⁶ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3645643) 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, 2036 + ... + 3381.

It is an arithmetic number, because the mean of its divisors is an integer number (912933).

Almost surely, 2^3645641 is an apocalyptic number.

It is an amenable number.

3645641 is a deficient number, since it is larger than the sum of its proper divisors (6091).

3645641 is an equidigital number, since it uses as much as digits as its factorization.

3645641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090.

The product of its digits is 8640, while the sum is 29.

The square root of 3645641 is about 1909.3561742116. The cubic root of 3645641 is about 153.9068560267.

The spelling of 3645641 in words is "three million, six hundred forty-five thousand, six hundred forty-one".