129996047 has 4 divisors (see below), whose sum is σ = 130277280. Its totient is φ = 129714816.

The previous prime is 129996037. The next prime is 129996049. The reversal of 129996047 is 740699921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129996047 - 2⁸ = 129995791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129995992 and 129996010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129996049) 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, 139922 + ... + 140847.

It is an arithmetic number, because the mean of its divisors is an integer number (32569320).

Almost surely, 2^129996047 is an apocalyptic number.

129996047 is a deficient number, since it is larger than the sum of its proper divisors (281233).

129996047 is an equidigital number, since it uses as much as digits as its factorization.

129996047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281232.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 129996047 is about 11401.5808991560. The cubic root of 129996047 is about 506.5745672181.

The spelling of 129996047 in words is "one hundred twenty-nine million, nine hundred ninety-six thousand, forty-seven".