3644691 has 8 divisors (see below), whose sum is σ = 5027280. Its totient is φ = 2345952.

The previous prime is 3644659. The next prime is 3644699. The reversal of 3644691 is 1964463.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3644691 - 2⁵ = 3644659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3644699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20860 + ... + 21033.

It is an arithmetic number, because the mean of its divisors is an integer number (628410).

Almost surely, 2^3644691 is an apocalyptic number.

3644691 is a deficient number, since it is larger than the sum of its proper divisors (1382589).

3644691 is a wasteful number, since it uses less digits than its factorization.

3644691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41925.

The product of its digits is 15552, while the sum is 33.

The square root of 3644691 is about 1909.1073830458. The cubic root of 3644691 is about 153.8934862503.

The spelling of 3644691 in words is "three million, six hundred forty-four thousand, six hundred ninety-one".