3863921 has 4 divisors (see below), whose sum is σ = 3881472. Its totient is φ = 3846372.

The previous prime is 3863911. The next prime is 3863971. The reversal of 3863921 is 1293683.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1293683 = 17 ⋅76099.

It is a cyclic number.

It is not a de Polignac number, because 3863921 - 2⁶ = 3863857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3863911) 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, 8441 + ... + 8886.

It is an arithmetic number, because the mean of its divisors is an integer number (970368).

Almost surely, 2^3863921 is an apocalyptic number.

It is an amenable number.

3863921 is a deficient number, since it is larger than the sum of its proper divisors (17551).

3863921 is a wasteful number, since it uses less digits than its factorization.

3863921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17550.

The product of its digits is 7776, while the sum is 32.

The square root of 3863921 is about 1965.6858853845. The cubic root of 3863921 is about 156.9191978765.

The spelling of 3863921 in words is "three million, eight hundred sixty-three thousand, nine hundred twenty-one".