4381840 has 20 divisors (see below), whose sum is σ = 10187964. Its totient is φ = 1752704.

The previous prime is 4381823. The next prime is 4381847. The reversal of 4381840 is 481834.

It can be written as a sum of positive squares in 2 ways, for example, as 3154176 + 1227664 = 1776^2 + 1108^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4381799 and 4381808.

It is not an unprimeable number, because it can be changed into a prime (4381847) 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, 27307 + ... + 27466.

Almost surely, 2^4381840 is an apocalyptic number.

4381840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4381840 is an abundant number, since it is smaller than the sum of its proper divisors (5806124).

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

4381840 is a wasteful number, since it uses less digits than its factorization.

4381840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54786 (or 54780 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 4381840 is about 2093.2845004920. The cubic root of 4381840 is about 163.6385057707.

It can be divided in two parts, 438 and 1840, that added together give a triangular number (2278 = T₆₇).

The spelling of 4381840 in words is "four million, three hundred eighty-one thousand, eight hundred forty".