3618221 has 4 divisors (see below), whose sum is σ = 3633600. Its totient is φ = 3602844.

The previous prime is 3618217. The next prime is 3618233. The reversal of 3618221 is 1228163.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3618221 - 2² = 3618217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3618211) 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, 7331 + ... + 7808.

It is an arithmetic number, because the mean of its divisors is an integer number (908400).

Almost surely, 2^3618221 is an apocalyptic number.

It is an amenable number.

3618221 is a deficient number, since it is larger than the sum of its proper divisors (15379).

3618221 is a wasteful number, since it uses less digits than its factorization.

3618221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15378.

The product of its digits is 576, while the sum is 23.

The square root of 3618221 is about 1902.1621907713. The cubic root of 3618221 is about 153.5200241254.

The spelling of 3618221 in words is "three million, six hundred eighteen thousand, two hundred twenty-one".