40590721 has 2 divisors, whose sum is σ = 40590722. Its totient is φ = 40590720.

The previous prime is 40590709. The next prime is 40590733. The reversal of 40590721 is 12709504.

It is a happy number.

40590721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (40590709) and next prime (40590733).

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 1703025 = 6236^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 40590721 - 2¹⁵ = 40557953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40590721.

It is not a weakly prime, because it can be changed into another prime (40597721) 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, 20295360 + 20295361.

It is an arithmetic number, because the mean of its divisors is an integer number (20295361).

Almost surely, 2^40590721 is an apocalyptic number.

It is an amenable number.

40590721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40590721 is an equidigital number, since it uses as much as digits as its factorization.

40590721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 40590721 is about 6371.0847585007. The cubic root of 40590721 is about 343.6705003592.

The spelling of 40590721 in words is "forty million, five hundred ninety thousand, seven hundred twenty-one".