3821540 has 24 divisors (see below), whose sum is σ = 8103480. Its totient is φ = 1513728.

The previous prime is 3821513. The next prime is 3821563. The reversal of 3821540 is 451283.

It can be written as a sum of positive squares in 4 ways, for example, as 50176 + 3771364 = 224^2 + 1942^2 .

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 7 ways as a sum of consecutive naturals, for example, 1304 + ... + 3056.

It is an arithmetic number, because the mean of its divisors is an integer number (337645).

Almost surely, 2^3821540 is an apocalyptic number.

It is an amenable number.

3821540 is an abundant number, since it is smaller than the sum of its proper divisors (4281940).

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

3821540 is a wasteful number, since it uses less digits than its factorization.

3821540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 3821540 is about 1954.8759551440. The cubic root of 3821540 is about 156.3433703269.

The spelling of 3821540 in words is "three million, eight hundred twenty-one thousand, five hundred forty".