129040027 has 4 divisors (see below), whose sum is σ = 129862096. Its totient is φ = 128217960.

The previous prime is 129040003. The next prime is 129040031. The reversal of 129040027 is 720040921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 720040921 = 23 ⋅31306127.

It is a cyclic number.

It is not a de Polignac number, because 129040027 - 2⁷ = 129039899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129039983 and 129040010.

It is not an unprimeable number, because it can be changed into a prime (129070027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410799 + ... + 411112.

It is an arithmetic number, because the mean of its divisors is an integer number (32465524).

Almost surely, 2^129040027 is an apocalyptic number.

129040027 is a deficient number, since it is larger than the sum of its proper divisors (822069).

129040027 is an equidigital number, since it uses as much as digits as its factorization.

129040027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822068.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 129040027 is about 11359.5786453548. The cubic root of 129040027 is about 505.3296896263.

Adding to 129040027 its reverse (720040921), we get a palindrome (849080948).

The spelling of 129040027 in words is "one hundred twenty-nine million, forty thousand, twenty-seven".