129475847 has 4 divisors (see below), whose sum is σ = 129503256. Its totient is φ = 129448440.

The previous prime is 129475837. The next prime is 129475867. The reversal of 129475847 is 748574921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748574921 = 4019 ⋅186259.

It is a cyclic number.

It is not a de Polignac number, because 129475847 - 2⁶ = 129475783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129475817) 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, 4604 + ... + 16737.

It is an arithmetic number, because the mean of its divisors is an integer number (32375814).

Almost surely, 2^129475847 is an apocalyptic number.

129475847 is a deficient number, since it is larger than the sum of its proper divisors (27409).

129475847 is an equidigital number, since it uses as much as digits as its factorization.

129475847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27408.

The product of its digits is 564480, while the sum is 47.

The square root of 129475847 is about 11378.7454053599. The cubic root of 129475847 is about 505.8979507993.

The spelling of 129475847 in words is "one hundred twenty-nine million, four hundred seventy-five thousand, eight hundred forty-seven".