129840127 has 2 divisors, whose sum is σ = 129840128. Its totient is φ = 129840126.

The previous prime is 129840119. The next prime is 129840131. The reversal of 129840127 is 721048921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129840127 - 2³ = 129840119 is a prime.

It is a super-2 number, since 2×129840127² = 33716917158752258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129840092 and 129840101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129840157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64920063 + 64920064.

It is an arithmetic number, because the mean of its divisors is an integer number (64920064).

Almost surely, 2^129840127 is an apocalyptic number.

129840127 is a deficient number, since it is larger than the sum of its proper divisors (1).

129840127 is an equidigital number, since it uses as much as digits as its factorization.

129840127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 129840127 is about 11394.7411993428. The cubic root of 129840127 is about 506.3719541177.

The spelling of 129840127 in words is "one hundred twenty-nine million, eight hundred forty thousand, one hundred twenty-seven".