4221624 has 32 divisors (see below), whose sum is σ = 11514240. Its totient is φ = 1279200.

The previous prime is 4221619. The next prime is 4221631. The reversal of 4221624 is 4261224.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 4221624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7732 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (359820).

Almost surely, 2^4221624 is an apocalyptic number.

4221624 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

4221624 is an abundant number, since it is smaller than the sum of its proper divisors (7292616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221624 is a wasteful number, since it uses less digits than its factorization.

4221624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16011 (or 16007 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 4221624 is about 2054.6590958113. The cubic root of 4221624 is about 161.6192858400.

Adding to 4221624 its reverse (4261224), we get a palindrome (8482848).

The spelling of 4221624 in words is "four million, two hundred twenty-one thousand, six hundred twenty-four".