4040340721 has 2 divisors, whose sum is σ = 4040340722. Its totient is φ = 4040340720.

The previous prime is 4040340677. The next prime is 4040340749. The reversal of 4040340721 is 1270430404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2651735025 + 1388605696 = 51495^2 + 37264^2 .

It is a cyclic number.

It is not a de Polignac number, because 4040340721 - 2¹³ = 4040332529 is a prime.

It is not a weakly prime, because it can be changed into another prime (4040340761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2020170360 + 2020170361.

It is an arithmetic number, because the mean of its divisors is an integer number (2020170361).

Almost surely, 2^4040340721 is an apocalyptic number.

It is an amenable number.

4040340721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4040340721 is an equidigital number, since it uses as much as digits as its factorization.

4040340721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 4040340721 is about 63563.6745397873. The cubic root of 4040340721 is about 1592.7196208424.

The spelling of 4040340721 in words is "four billion, forty million, three hundred forty thousand, seven hundred twenty-one".