129948647 has 4 divisors (see below), whose sum is σ = 130521336. Its totient is φ = 129375960.

The previous prime is 129948641. The next prime is 129948649. The reversal of 129948647 is 746849921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746849921 = 37 ⋅20185133.

It is a cyclic number.

It is not a de Polignac number, because 129948647 - 2⁶ = 129948583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129948595 and 129948604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129948641) 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, 286004 + ... + 286457.

It is an arithmetic number, because the mean of its divisors is an integer number (32630334).

Almost surely, 2^129948647 is an apocalyptic number.

129948647 is a deficient number, since it is larger than the sum of its proper divisors (572689).

129948647 is an equidigital number, since it uses as much as digits as its factorization.

129948647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572688.

The product of its digits is 870912, while the sum is 50.

The square root of 129948647 is about 11399.5020505283. The cubic root of 129948647 is about 506.5129895675.

The spelling of 129948647 in words is "one hundred twenty-nine million, nine hundred forty-eight thousand, six hundred forty-seven".