4639221 has 8 divisors (see below), whose sum is σ = 6872960. Its totient is φ = 3092796.

The previous prime is 4639189. The next prime is 4639237. The reversal of 4639221 is 1229364.

4639221 is a `hidden beast` number, since 4 + 639 + 2 + 21 = 666.

It is not a de Polignac number, because 4639221 - 2⁵ = 4639189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 171823 = 4639221 / (4 + 6 + 3 + 9 + 2 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4639291) 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, 85885 + ... + 85938.

It is an arithmetic number, because the mean of its divisors is an integer number (859120).

Almost surely, 2^4639221 is an apocalyptic number.

It is an amenable number.

4639221 is a deficient number, since it is larger than the sum of its proper divisors (2233739).

4639221 is a wasteful number, since it uses less digits than its factorization.

4639221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171832 (or 171826 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 4639221 is about 2153.8850944282. The cubic root of 4639221 is about 166.7816837193.

The spelling of 4639221 in words is "four million, six hundred thirty-nine thousand, two hundred twenty-one".