40027721 has 2 divisors, whose sum is σ = 40027722. Its totient is φ = 40027720.

The previous prime is 40027697. The next prime is 40027763. The reversal of 40027721 is 12772004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22429696 + 17598025 = 4736^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 40027721 - 2⁶ = 40027657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40027781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20013860 + 20013861.

It is an arithmetic number, because the mean of its divisors is an integer number (20013861).

Almost surely, 2^40027721 is an apocalyptic number.

It is an amenable number.

40027721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40027721 is an equidigital number, since it uses as much as digits as its factorization.

40027721 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 40027721 is about 6326.7464782461. The cubic root of 40027721 is about 342.0741748305.

Adding to 40027721 its reverse (12772004), we get a palindrome (52799725).

The spelling of 40027721 in words is "forty million, twenty-seven thousand, seven hundred twenty-one".