129136838 has 8 divisors (see below), whose sum is σ = 195099240. Its totient is φ = 64103760.

The previous prime is 129136829. The next prime is 129136873. The reversal of 129136838 is 838631921.

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

It is a junction number, because it is equal to n+sod(n) for n = 129136795 and 129136804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231983 + ... + 232538.

It is an arithmetic number, because the mean of its divisors is an integer number (24387405).

Almost surely, 2^129136838 is an apocalyptic number.

129136838 is a deficient number, since it is larger than the sum of its proper divisors (65962402).

129136838 is a wasteful number, since it uses less digits than its factorization.

129136838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464662.

The product of its digits is 62208, while the sum is 41.

The square root of 129136838 is about 11363.8390520105. The cubic root of 129136838 is about 505.4560308982.

The spelling of 129136838 in words is "one hundred twenty-nine million, one hundred thirty-six thousand, eight hundred thirty-eight".