4221240 has 64 divisors (see below), whose sum is σ = 13111200. Its totient is φ = 1085952.

The previous prime is 4221229. The next prime is 4221247. The reversal of 4221240 is 421224.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2874 + ... + 4086.

Almost surely, 2^4221240 is an apocalyptic number.

4221240 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 4221240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6555600).

4221240 is an abundant number, since it is smaller than the sum of its proper divisors (8889960).

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

4221240 is a wasteful number, since it uses less digits than its factorization.

4221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 4221240 is about 2054.5656475275. The cubic root of 4221240 is about 161.6143853808.

Adding to 4221240 its reverse (421224), we get a palindrome (4642464).

The spelling of 4221240 in words is "four million, two hundred twenty-one thousand, two hundred forty".