129427027 has 2 divisors, whose sum is σ = 129427028. Its totient is φ = 129427026.

The previous prime is 129427021. The next prime is 129427057. The reversal of 129427027 is 720724921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129427027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129426983 and 129427001.

It is not a weakly prime, because it can be changed into another prime (129427021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64713513 + 64713514.

It is an arithmetic number, because the mean of its divisors is an integer number (64713514).

Almost surely, 2^129427027 is an apocalyptic number.

129427027 is a deficient number, since it is larger than the sum of its proper divisors (1).

129427027 is an equidigital number, since it uses as much as digits as its factorization.

129427027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 129427027 is about 11376.5999753881. The cubic root of 129427027 is about 505.8343583910.

The spelling of 129427027 in words is "one hundred twenty-nine million, four hundred twenty-seven thousand, twenty-seven".