129747939 has 8 divisors (see below), whose sum is σ = 173068560. Its totient is φ = 86462976.

The previous prime is 129747929. The next prime is 129747949. The reversal of 129747939 is 939747921.

It is an interprime number because it is at equal distance from previous prime (129747929) and next prime (129747949).

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

It is not a de Polignac number, because 129747939 - 2⁴ = 129747923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129747891 and 129747900.

It is not an unprimeable number, because it can be changed into a prime (129747929) 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 7 ways as a sum of consecutive naturals, for example, 1227 + ... + 16155.

It is an arithmetic number, because the mean of its divisors is an integer number (21633570).

Almost surely, 2^129747939 is an apocalyptic number.

129747939 is a deficient number, since it is larger than the sum of its proper divisors (43320621).

129747939 is a wasteful number, since it uses less digits than its factorization.

129747939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17829.

The product of its digits is 857304, while the sum is 51.

The square root of 129747939 is about 11390.6952816762. The cubic root of 129747939 is about 506.2520824179.

The spelling of 129747939 in words is "one hundred twenty-nine million, seven hundred forty-seven thousand, nine hundred thirty-nine".