4378221 has 12 divisors (see below), whose sum is σ = 6386848. Its totient is φ = 2889864.

The previous prime is 4378219. The next prime is 4378229. The reversal of 4378221 is 1228734.

4378221 is a `hidden beast` number, since 437 + 8 + 221 = 666.

4378221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4378221 - 2¹ = 4378219 is a prime.

It is a d-powerful number, because it can be written as 4² + 3¹¹ + 7⁴ + 8⁴ + 2⁸ + 2²² + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4378229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1435 + ... + 3288.

Almost surely, 2^4378221 is an apocalyptic number.

It is an amenable number.

4378221 is a deficient number, since it is larger than the sum of its proper divisors (2008627).

4378221 is a wasteful number, since it uses less digits than its factorization.

4378221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832 (or 4829 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 4378221 is about 2092.4198909397. The cubic root of 4378221 is about 163.5934432046.

It can be divided in two parts, 4 and 378221, that added together give a square (378225 = 615²).

The spelling of 4378221 in words is "four million, three hundred seventy-eight thousand, two hundred twenty-one".