3821641 has 4 divisors (see below), whose sum is σ = 4022800. Its totient is φ = 3620484.

The previous prime is 3821639. The next prime is 3821647. The reversal of 3821641 is 1461283.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3821641 - 2¹ = 3821639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3821647) 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, 100551 + ... + 100588.

It is an arithmetic number, because the mean of its divisors is an integer number (1005700).

Almost surely, 2^3821641 is an apocalyptic number.

It is an amenable number.

3821641 is a deficient number, since it is larger than the sum of its proper divisors (201159).

3821641 is a wasteful number, since it uses less digits than its factorization.

3821641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201158.

The product of its digits is 1152, while the sum is 25.

The square root of 3821641 is about 1954.9017878144. The cubic root of 3821641 is about 156.3447476548.

The spelling of 3821641 in words is "three million, eight hundred twenty-one thousand, six hundred forty-one".