4221040 has 40 divisors (see below), whose sum is σ = 10334160. Its totient is φ = 1598976.

The previous prime is 4221031. The next prime is 4221047. The reversal of 4221040 is 401224.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 4221040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132 + ... + 2908.

It is an arithmetic number, because the mean of its divisors is an integer number (258354).

Almost surely, 2^4221040 is an apocalyptic number.

4221040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5167080).

4221040 is an abundant number, since it is smaller than the sum of its proper divisors (6113120).

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

4221040 is a wasteful number, since it uses less digits than its factorization.

4221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809 (or 2803 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4221040 is about 2054.5169748629. The cubic root of 4221040 is about 161.6118329407.

Adding to 4221040 its reverse (401224), we get a palindrome (4622264).

The spelling of 4221040 in words is "four million, two hundred twenty-one thousand, forty".