3873821 has 8 divisors (see below), whose sum is σ = 4619904. Its totient is φ = 3175920.

The previous prime is 3873817. The next prime is 3873829. The reversal of 3873821 is 1283783.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3873821 - 2² = 3873817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3873829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11870 + ... + 12191.

It is an arithmetic number, because the mean of its divisors is an integer number (577488).

Almost surely, 2^3873821 is an apocalyptic number.

It is an amenable number.

3873821 is a deficient number, since it is larger than the sum of its proper divisors (746083).

3873821 is a wasteful number, since it uses less digits than its factorization.

3873821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24091.

The product of its digits is 8064, while the sum is 32.

The square root of 3873821 is about 1968.2024794213. The cubic root of 3873821 is about 157.0531011637.

The spelling of 3873821 in words is "three million, eight hundred seventy-three thousand, eight hundred twenty-one".