3801820 has 36 divisors (see below), whose sum is σ = 8781192. Its totient is φ = 1381600.

The previous prime is 3801803. The next prime is 3801827. The reversal of 3801820 is 281083.

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 = 3801791 and 3801800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3801827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1635 + ... + 3205.

It is an arithmetic number, because the mean of its divisors is an integer number (243922).

Almost surely, 2^3801820 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 3801820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4390596).

3801820 is an abundant number, since it is smaller than the sum of its proper divisors (4979372).

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

3801820 is a wasteful number, since it uses less digits than its factorization.

3801820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 3801820 is about 1949.8256332298. The cubic root of 3801820 is about 156.0739841924.

The spelling of 3801820 in words is "three million, eight hundred one thousand, eight hundred twenty".