3810721 has 2 divisors, whose sum is σ = 3810722. Its totient is φ = 3810720.

The previous prime is 3810707. The next prime is 3810727. The reversal of 3810721 is 1270183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2676496 + 1134225 = 1636^2 + 1065^2 .

It is an emirp because it is prime and its reverse (1270183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3810721 - 2¹³ = 3802529 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 3810692 and 3810701.

It is not a weakly prime, because it can be changed into another prime (3810727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1905360 + 1905361.

It is an arithmetic number, because the mean of its divisors is an integer number (1905361).

Almost surely, 2^3810721 is an apocalyptic number.

It is an amenable number.

3810721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3810721 is an equidigital number, since it uses as much as digits as its factorization.

3810721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 3810721 is about 1952.1068106023. The cubic root of 3810721 is about 156.1956918462.

The spelling of 3810721 in words is "three million, eight hundred ten thousand, seven hundred twenty-one".