3644891 has 4 divisors (see below), whose sum is σ = 3648792. Its totient is φ = 3640992.

The previous prime is 3644873. The next prime is 3644899. The reversal of 3644891 is 1984463.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3644891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3644899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380 + ... + 2726.

It is an arithmetic number, because the mean of its divisors is an integer number (912198).

Almost surely, 2^3644891 is an apocalyptic number.

3644891 is a deficient number, since it is larger than the sum of its proper divisors (3901).

3644891 is a wasteful number, since it uses less digits than its factorization.

3644891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900.

The product of its digits is 20736, while the sum is 35.

The square root of 3644891 is about 1909.1597628276. The cubic root of 3644891 is about 153.8963011331.

The spelling of 3644891 in words is "three million, six hundred forty-four thousand, eight hundred ninety-one".