4381820 has 12 divisors (see below), whose sum is σ = 9201864. Its totient is φ = 1752720.

The previous prime is 4381807. The next prime is 4381823. The reversal of 4381820 is 281834.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 4381820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4381823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109526 + ... + 109565.

It is an arithmetic number, because the mean of its divisors is an integer number (766822).

Almost surely, 2^4381820 is an apocalyptic number.

It is an amenable number.

4381820 is an abundant number, since it is smaller than the sum of its proper divisors (4820044).

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

4381820 is a wasteful number, since it uses less digits than its factorization.

4381820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219100 (or 219098 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 4381820 is about 2093.2797233050. The cubic root of 4381820 is about 163.6382568056.

The spelling of 4381820 in words is "four million, three hundred eighty-one thousand, eight hundred twenty".