3910721 has 4 divisors (see below), whose sum is σ = 4001712. Its totient is φ = 3819732.

The previous prime is 3910717. The next prime is 3910727. The reversal of 3910721 is 1270193.

3910721 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 not a de Polignac number, because 3910721 - 2² = 3910717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3910727) 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, 45431 + ... + 45516.

It is an arithmetic number, because the mean of its divisors is an integer number (1000428).

Almost surely, 2^3910721 is an apocalyptic number.

It is an amenable number.

3910721 is a deficient number, since it is larger than the sum of its proper divisors (90991).

3910721 is an equidigital number, since it uses as much as digits as its factorization.

3910721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90990.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 3910721 is about 1977.5542976111. The cubic root of 3910721 is about 157.5501948017.

The spelling of 3910721 in words is "three million, nine hundred ten thousand, seven hundred twenty-one".