129215138 has 8 divisors (see below), whose sum is σ = 208732188. Its totient is φ = 59637744.

The previous prime is 129215117. The next prime is 129215159. The reversal of 129215138 is 831512921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129215117) and next prime (129215159).

It can be written as a sum of positive squares in 2 ways, for example, as 124255609 + 4959529 = 11147^2 + 2227^2 .

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

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, 2484881 + ... + 2484932.

Almost surely, 2^129215138 is an apocalyptic number.

129215138 is a deficient number, since it is larger than the sum of its proper divisors (79517050).

129215138 is a wasteful number, since it uses less digits than its factorization.

129215138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4969828.

The product of its digits is 4320, while the sum is 32.

The square root of 129215138 is about 11367.2836684935. The cubic root of 129215138 is about 505.5581685777.

The spelling of 129215138 in words is "one hundred twenty-nine million, two hundred fifteen thousand, one hundred thirty-eight".