3859721 has 4 divisors (see below), whose sum is σ = 3925200. Its totient is φ = 3794244.

The previous prime is 3859693. The next prime is 3859759. The reversal of 3859721 is 1279583.

3859721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-3859721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3859771) by changing a digit.

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, 32651 + ... + 32768.

It is an arithmetic number, because the mean of its divisors is an integer number (981300).

Almost surely, 2^3859721 is an apocalyptic number.

It is an amenable number.

3859721 is a deficient number, since it is larger than the sum of its proper divisors (65479).

3859721 is an equidigital number, since it uses as much as digits as its factorization.

3859721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65478.

The product of its digits is 15120, while the sum is 35.

The square root of 3859721 is about 1964.6172655253. The cubic root of 3859721 is about 156.8623213194.

The spelling of 3859721 in words is "three million, eight hundred fifty-nine thousand, seven hundred twenty-one".