129117938 has 16 divisors (see below), whose sum is σ = 203767704. Its totient is φ = 61280640.

The previous prime is 129117917. The next prime is 129117943. The reversal of 129117938 is 839711921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 127622209 + 1495729 = 11297^2 + 1223^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 129117895 and 129117904.

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, 18245 + ... + 24312.

Almost surely, 2^129117938 is an apocalyptic number.

129117938 is a deficient number, since it is larger than the sum of its proper divisors (74649766).

129117938 is a wasteful number, since it uses less digits than its factorization.

129117938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42637.

The product of its digits is 27216, while the sum is 41.

The square root of 129117938 is about 11363.0074364140. The cubic root of 129117938 is about 505.4313707903.

The spelling of 129117938 in words is "one hundred twenty-nine million, one hundred seventeen thousand, nine hundred thirty-eight".