3727407721 has 2 divisors, whose sum is σ = 3727407722. Its totient is φ = 3727407720.

The previous prime is 3727407701. The next prime is 3727407731. The reversal of 3727407721 is 1277047273.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2216997225 + 1510410496 = 47085^2 + 38864^2 .

It is an emirp because it is prime and its reverse (1277047273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3727407721 - 2⁵ = 3727407689 is a prime.

It is not a weakly prime, because it can be changed into another prime (3727407701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1863703860 + 1863703861.

It is an arithmetic number, because the mean of its divisors is an integer number (1863703861).

Almost surely, 2^3727407721 is an apocalyptic number.

It is an amenable number.

3727407721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3727407721 is an equidigital number, since it uses as much as digits as its factorization.

3727407721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115248, while the sum is 40.

The square root of 3727407721 is about 61052.4997113140. The cubic root of 3727407721 is about 1550.4899902132.

The spelling of 3727407721 in words is "three billion, seven hundred twenty-seven million, four hundred seven thousand, seven hundred twenty-one".