4221784 has 16 divisors (see below), whose sum is σ = 9046800. Its totient is φ = 1809312.

The previous prime is 4221779. The next prime is 4221787. The reversal of 4221784 is 4871224.

It is a Harshad number since it is a multiple of its sum of digits (28).

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

It is a d-powerful number, because it can be written as 4⁷ + 2¹¹ + 2¹³ + 1 + 7³ + 8³ + 4¹¹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221787) 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, 37639 + ... + 37750.

It is an arithmetic number, because the mean of its divisors is an integer number (565425).

Almost surely, 2^4221784 is an apocalyptic number.

It is an amenable number.

4221784 is an abundant number, since it is smaller than the sum of its proper divisors (4825016).

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

4221784 is a wasteful number, since it uses less digits than its factorization.

4221784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75402 (or 75398 counting only the distinct ones).

The product of its digits is 3584, while the sum is 28.

The square root of 4221784 is about 2054.6980313418. The cubic root of 4221784 is about 161.6213276102.

It can be divided in two parts, 4221 and 784, that added together give a palindrome (5005).

The spelling of 4221784 in words is "four million, two hundred twenty-one thousand, seven hundred eighty-four".