3644405 has 4 divisors (see below), whose sum is σ = 4373292. Its totient is φ = 2915520.

The previous prime is 3644357. The next prime is 3644411. The reversal of 3644405 is 5044463.

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 935089 + 2709316 = 967^2 + 1646^2 .

It is not a de Polignac number, because 3644405 - 2⁸ = 3644149 is a prime.

It is a Duffinian 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, 364436 + ... + 364445.

It is an arithmetic number, because the mean of its divisors is an integer number (1093323).

Almost surely, 2^3644405 is an apocalyptic number.

It is an amenable number.

3644405 is a deficient number, since it is larger than the sum of its proper divisors (728887).

3644405 is an equidigital number, since it uses as much as digits as its factorization.

3644405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728886.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 3644405 is about 1909.0324774608. The cubic root of 3644405 is about 153.8894607889.

Adding to 3644405 its reverse (5044463), we get a palindrome (8688868).

The spelling of 3644405 in words is "three million, six hundred forty-four thousand, four hundred five".