4220240 has 40 divisors (see below), whose sum is σ = 9963648. Its totient is φ = 1662080.

The previous prime is 4220239. The next prime is 4220243. The reversal of 4220240 is 420224.

It is a happy number.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4220243) 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, 5309 + ... + 6051.

Almost surely, 2^4220240 is an apocalyptic number.

4220240 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 4220240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4981824).

4220240 is an abundant number, since it is smaller than the sum of its proper divisors (5743408).

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

4220240 is a wasteful number, since it uses less digits than its factorization.

4220240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 4220240 is about 2054.3222726729. The cubic root of 4220240 is about 161.6016223737.

Adding to 4220240 its reverse (420224), we get a palindrome (4640464).

The spelling of 4220240 in words is "four million, two hundred twenty thousand, two hundred forty".