4021380 has 96 divisors (see below), whose sum is σ = 13668480. Its totient is φ = 973440.

The previous prime is 4021379. The next prime is 4021387. The reversal of 4021380 is 831204.

It is a happy number.

4021380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (4021387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5602 + ... + 6278.

It is an arithmetic number, because the mean of its divisors is an integer number (142380).

Almost surely, 2^4021380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6834240).

4021380 is an abundant number, since it is smaller than the sum of its proper divisors (9647100).

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

4021380 is a wasteful number, since it uses less digits than its factorization.

4021380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4021380 is about 2005.3378767679. The cubic root of 4021380 is about 159.0224247474.

Adding to 4021380 its reverse (831204), we get a palindrome (4852584).

The spelling of 4021380 in words is "four million, twenty-one thousand, three hundred eighty".