40989646729 has 2 divisors, whose sum is σ = 40989646730. Its totient is φ = 40989646728.

The previous prime is 40989646609. The next prime is 40989646741. The reversal of 40989646729 is 92764698904.

It is a happy number.

40989646729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35249311504 + 5740335225 = 187748^2 + 75765^2 .

It is a cyclic number.

It is not a de Polignac number, because 40989646729 - 2¹³ = 40989638537 is a prime.

It is a super-2 number, since 2×40989646729² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40989646759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20494823364 + 20494823365.

It is an arithmetic number, because the mean of its divisors is an integer number (20494823365).

Almost surely, 2^40989646729 is an apocalyptic number.

It is an amenable number.

40989646729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40989646729 is an equidigital number, since it uses as much as digits as its factorization.

40989646729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47029248, while the sum is 64.

The spelling of 40989646729 in words is "forty billion, nine hundred eighty-nine million, six hundred forty-six thousand, seven hundred twenty-nine".