4388221 has 4 divisors (see below), whose sum is σ = 4619200. Its totient is φ = 4157244.

The previous prime is 4388207. The next prime is 4388257. The reversal of 4388221 is 1228834.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1228834 = 2 ⋅614417.

It is a cyclic number.

It is not a de Polignac number, because 4388221 - 2¹⁵ = 4355453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4388221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4388201) 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, 115461 + ... + 115498.

It is an arithmetic number, because the mean of its divisors is an integer number (1154800).

Almost surely, 2^4388221 is an apocalyptic number.

It is an amenable number.

4388221 is a deficient number, since it is larger than the sum of its proper divisors (230979).

4388221 is a wasteful number, since it uses less digits than its factorization.

4388221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230978.

The product of its digits is 3072, while the sum is 28.

The square root of 4388221 is about 2094.8081057701. The cubic root of 4388221 is about 163.7178994241.

The spelling of 4388221 in words is "four million, three hundred eighty-eight thousand, two hundred twenty-one".