4381640 has 16 divisors (see below), whose sum is σ = 9858780. Its totient is φ = 1752640.

The previous prime is 4381607. The next prime is 4381667. The reversal of 4381640 is 461834.

It can be written as a sum of positive squares in 2 ways, for example, as 4024036 + 357604 = 2006^2 + 598^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54731 + ... + 54810.

Almost surely, 2^4381640 is an apocalyptic number.

4381640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4381640 is an abundant number, since it is smaller than the sum of its proper divisors (5477140).

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

4381640 is a wasteful number, since it uses less digits than its factorization.

4381640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109552 (or 109548 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 4381640 is about 2093.2367281318. The cubic root of 4381640 is about 163.6360160861.

The spelling of 4381640 in words is "four million, three hundred eighty-one thousand, six hundred forty".