3886721 has 4 divisors (see below), whose sum is σ = 3936000. Its totient is φ = 3837444.

The previous prime is 3886717. The next prime is 3886723. The reversal of 3886721 is 1276883.

3886721 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, and also an emirpimes, since its reverse is a distinct semiprime: 1276883 = 89 ⋅14347.

It is a cyclic number.

It is not a de Polignac number, because 3886721 - 2² = 3886717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3886723) 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, 24521 + ... + 24678.

It is an arithmetic number, because the mean of its divisors is an integer number (984000).

Almost surely, 2^3886721 is an apocalyptic number.

It is an amenable number.

3886721 is a deficient number, since it is larger than the sum of its proper divisors (49279).

3886721 is an equidigital number, since it uses as much as digits as its factorization.

3886721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49278.

The product of its digits is 16128, while the sum is 35.

The square root of 3886721 is about 1971.4768575867. The cubic root of 3886721 is about 157.2272393323.

The spelling of 3886721 in words is "three million, eight hundred eighty-six thousand, seven hundred twenty-one".