129126405 has 8 divisors (see below), whose sum is σ = 206602272. Its totient is φ = 68867408.

The previous prime is 129126401. The next prime is 129126419. The reversal of 129126405 is 504621921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129126405 - 2² = 129126401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129126401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4304199 + ... + 4304228.

It is an arithmetic number, because the mean of its divisors is an integer number (25825284).

Almost surely, 2^129126405 is an apocalyptic number.

129126405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129126405 is a deficient number, since it is larger than the sum of its proper divisors (77475867).

129126405 is an equidigital number, since it uses as much as digits as its factorization.

129126405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8608435.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 129126405 is about 11363.3799989264. The cubic root of 129126405 is about 505.4424185552.

The spelling of 129126405 in words is "one hundred twenty-nine million, one hundred twenty-six thousand, four hundred five".