40288729021 has 2 divisors, whose sum is σ = 40288729022. Its totient is φ = 40288729020.

The previous prime is 40288729009. The next prime is 40288729057. The reversal of 40288729021 is 12092788204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35498704921 + 4790024100 = 188411^2 + 69210^2 .

It is a cyclic number.

It is not a de Polignac number, because 40288729021 - 2⁹ = 40288728509 is a prime.

It is a super-2 number, since 2×40288729021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40288729001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20144364510 + 20144364511.

It is an arithmetic number, because the mean of its divisors is an integer number (20144364511).

Almost surely, 2^40288729021 is an apocalyptic number.

It is an amenable number.

40288729021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40288729021 is an equidigital number, since it uses as much as digits as its factorization.

40288729021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 40288729021 in words is "forty billion, two hundred eighty-eight million, seven hundred twenty-nine thousand, twenty-one".