3821620 has 48 divisors (see below), whose sum is σ = 9072000. Its totient is φ = 1339520.

The previous prime is 3821581. The next prime is 3821627. The reversal of 3821620 is 261283.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 3821591 and 3821600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821627) 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, 6081 + ... + 6679.

It is an arithmetic number, because the mean of its divisors is an integer number (189000).

Almost surely, 2^3821620 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 3821620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4536000).

3821620 is an abundant number, since it is smaller than the sum of its proper divisors (5250380).

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

3821620 is a wasteful number, since it uses less digits than its factorization.

3821620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 3821620 is about 1954.8964166932. The cubic root of 3821620 is about 156.3444612817.

It can be divided in two parts, 382 and 1620, that added together give a palindrome (2002).

The spelling of 3821620 in words is "three million, eight hundred twenty-one thousand, six hundred twenty".