2381820 has 96 divisors (see below), whose sum is σ = 7838208. Its totient is φ = 529152.

The previous prime is 2381807. The next prime is 2381839. The reversal of 2381820 is 281832.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22207 + ... + 22313.

It is an arithmetic number, because the mean of its divisors is an integer number (81648).

2^2381820 is an apocalyptic number.

2381820 is a gapful number since it is divisible by the number (20) 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 2381820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3919104).

2381820 is an abundant number, since it is smaller than the sum of its proper divisors (5456388).

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

2381820 is a wasteful number, since it uses less digits than its factorization.

2381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 2381820 is about 1543.3146147173. The cubic root of 2381820 is about 133.5476691554.

The spelling of 2381820 in words is "two million, three hundred eighty-one thousand, eight hundred twenty".