3727721 has 2 divisors, whose sum is σ = 3727722. Its totient is φ = 3727720.

The previous prime is 3727699. The next prime is 3727723. The reversal of 3727721 is 1277273.

3727721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 714025 = 1736^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 3727721 - 2¹⁸ = 3465577 is a prime.

It is a Sophie Germain prime.

Together with 3727723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3727723) 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 as a sum of consecutive naturals, namely, 1863860 + 1863861.

It is an arithmetic number, because the mean of its divisors is an integer number (1863861).

Almost surely, 2^3727721 is an apocalyptic number.

It is an amenable number.

3727721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3727721 is an equidigital number, since it uses as much as digits as its factorization.

3727721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4116, while the sum is 29.

The square root of 3727721 is about 1930.7306906972. The cubic root of 3727721 is about 155.0533427224.

The spelling of 3727721 in words is "three million, seven hundred twenty-seven thousand, seven hundred twenty-one".