129965138 has 8 divisors (see below), whose sum is σ = 195070332. Its totient is φ = 64941696.

The previous prime is 129965137. The next prime is 129965161. The reversal of 129965138 is 831569921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 118962649 + 11002489 = 10907^2 + 3317^2 .

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 (129965137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16295 + ... + 22922.

Almost surely, 2^129965138 is an apocalyptic number.

129965138 is a deficient number, since it is larger than the sum of its proper divisors (65105194).

129965138 is a wasteful number, since it uses less digits than its factorization.

129965138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40876.

The product of its digits is 116640, while the sum is 44.

The square root of 129965138 is about 11400.2253486499. The cubic root of 129965138 is about 506.5344148320.

The spelling of 129965138 in words is "one hundred twenty-nine million, nine hundred sixty-five thousand, one hundred thirty-eight".