129189938 has 8 divisors (see below), whose sum is σ = 197441388. Its totient is φ = 63376144.

The previous prime is 129189937. The next prime is 129189941. The reversal of 129189938 is 839981921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 122257249 + 6932689 = 11057^2 + 2633^2 .

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

It is not an unprimeable number, because it can be changed into a prime (129189937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609281 + ... + 609492.

Almost surely, 2^129189938 is an apocalyptic number.

129189938 is a deficient number, since it is larger than the sum of its proper divisors (68251450).

129189938 is a wasteful number, since it uses less digits than its factorization.

129189938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218828.

The product of its digits is 279936, while the sum is 50.

The square root of 129189938 is about 11366.1751702145. The cubic root of 129189938 is about 505.5253011848.

The spelling of 129189938 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, nine hundred thirty-eight".