3644221403 has 8 divisors (see below), whose sum is σ = 3779392080. Its totient is φ = 3509684640.

The previous prime is 3644221391. The next prime is 3644221417. The reversal of 3644221403 is 3041224463.

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

It is a cyclic number.

It is not a de Polignac number, because 3644221403 - 2²⁸ = 3375785947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3644221423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146753 + ... + 169778.

It is an arithmetic number, because the mean of its divisors is an integer number (472424010).

Almost surely, 2^3644221403 is an apocalyptic number.

3644221403 is a deficient number, since it is larger than the sum of its proper divisors (135170677).

3644221403 is a wasteful number, since it uses less digits than its factorization.

3644221403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316957.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 3644221403 is about 60367.3869154529. The cubic root of 3644221403 is about 1538.8687654287.

Adding to 3644221403 its reverse (3041224463), we get a palindrome (6685445866).

The spelling of 3644221403 in words is "three billion, six hundred forty-four million, two hundred twenty-one thousand, four hundred three".