4021620 has 48 divisors (see below), whose sum is σ = 11393088. Its totient is φ = 1059840.

The previous prime is 4021613. The next prime is 4021627. The reversal of 4021620 is 261204.

It is an interprime number because it is at equal distance from previous prime (4021613) and next prime (4021627).

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

It is a self number, because there is not a number n which added to its sum of digits gives 4021620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021627) 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, 5475 + ... + 6165.

It is an arithmetic number, because the mean of its divisors is an integer number (237356).

Almost surely, 2^4021620 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 4021620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5696544).

4021620 is an abundant number, since it is smaller than the sum of its proper divisors (7371468).

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

4021620 is a wasteful number, since it uses less digits than its factorization.

4021620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 4021620 is about 2005.3977161651. The cubic root of 4021620 is about 159.0255882239.

Adding to 4021620 its reverse (261204), we get a palindrome (4282824).

The spelling of 4021620 in words is "four million, twenty-one thousand, six hundred twenty".