8381820 has 24 divisors (see below), whose sum is σ = 23469264. Its totient is φ = 2235136.

The previous prime is 8381819. The next prime is 8381843. The reversal of 8381820 is 281838.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69789 + ... + 69908.

It is an arithmetic number, because the mean of its divisors is an integer number (977886).

Almost surely, 2^8381820 is an apocalyptic number.

It is an amenable number.

8381820 is an abundant number, since it is smaller than the sum of its proper divisors (15087444).

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

8381820 is a wasteful number, since it uses less digits than its factorization.

8381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139709 (or 139707 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 8381820 is about 2895.1373024435. The cubic root of 8381820 is about 203.1325139627.

It can be divided in two parts, 83818 and 20, that added together give a palindrome (83838).

The spelling of 8381820 in words is "eight million, three hundred eighty-one thousand, eight hundred twenty".