40270721 has 2 divisors, whose sum is σ = 40270722. Its totient is φ = 40270720.

The previous prime is 40270717. The next prime is 40270751. The reversal of 40270721 is 12707204.

40270721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 1345600 = 6239^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 40270721 - 2² = 40270717 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40270751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20135360 + 20135361.

It is an arithmetic number, because the mean of its divisors is an integer number (20135361).

Almost surely, 2^40270721 is an apocalyptic number.

It is an amenable number.

40270721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40270721 is an equidigital number, since it uses as much as digits as its factorization.

40270721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 40270721 is about 6345.9216036759. The cubic root of 40270721 is about 342.7649992381.

Adding to 40270721 its reverse (12707204), we get a palindrome (52977925).

The spelling of 40270721 in words is "forty million, two hundred seventy thousand, seven hundred twenty-one".