129718436 has 24 divisors (see below), whose sum is σ = 238230720. Its totient is φ = 61684832.

The previous prime is 129718423. The next prime is 129718447. The reversal of 129718436 is 634817921.

It is a junction number, because it is equal to n+sod(n) for n = 129718393 and 129718402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12530 + ... + 20406.

It is an arithmetic number, because the mean of its divisors is an integer number (9926280).

Almost surely, 2^129718436 is an apocalyptic number.

It is an amenable number.

129718436 is a deficient number, since it is larger than the sum of its proper divisors (108512284).

129718436 is a wasteful number, since it uses less digits than its factorization.

129718436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8083 (or 8081 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 129718436 is about 11389.4001597977. The cubic root of 129718436 is about 506.2137077880.

The spelling of 129718436 in words is "one hundred twenty-nine million, seven hundred eighteen thousand, four hundred thirty-six".