129905147 has 4 divisors (see below), whose sum is σ = 136742280. Its totient is φ = 123068016.

The previous prime is 129905141. The next prime is 129905183. The reversal of 129905147 is 741509921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 741509921 = 367 ⋅2020463.

It is not a de Polignac number, because 129905147 - 2¹⁴ = 129888763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129905147.

It is not an unprimeable number, because it can be changed into a prime (129905141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3418538 + ... + 3418575.

It is an arithmetic number, because the mean of its divisors is an integer number (34185570).

Almost surely, 2^129905147 is an apocalyptic number.

129905147 is a deficient number, since it is larger than the sum of its proper divisors (6837133).

129905147 is an equidigital number, since it uses as much as digits as its factorization.

129905147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837132.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 129905147 is about 11397.5939127519. The cubic root of 129905147 is about 506.4564652544.

The spelling of 129905147 in words is "one hundred twenty-nine million, nine hundred five thousand, one hundred forty-seven".