4021424 has 40 divisors (see below), whose sum is σ = 8643792. Its totient is φ = 1797120.

The previous prime is 4021417. The next prime is 4021427. The reversal of 4021424 is 4241204.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (4021427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12692 + ... + 13004.

Almost surely, 2^4021424 is an apocalyptic number.

4021424 is a gapful number since it is divisible by the number (44) 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 4021424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4321896).

4021424 is an abundant number, since it is smaller than the sum of its proper divisors (4622368).

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

4021424 is a wasteful number, since it uses less digits than its factorization.

4021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 4021424 is about 2005.3488474577. The cubic root of 4021424 is about 159.0230047275.

Adding to 4021424 its reverse (4241204), we get a palindrome (8262628).

The spelling of 4021424 in words is "four million, twenty-one thousand, four hundred twenty-four".