129598138 has 4 divisors (see below), whose sum is σ = 194397210. Its totient is φ = 64799068.

The previous prime is 129598127. The next prime is 129598163. The reversal of 129598138 is 831895921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831895921 = 137 ⋅6072233.

It can be written as a sum of positive squares in only one way, i.e., 129345129 + 253009 = 11373^2 + 503^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32399533 + ... + 32399536.

Almost surely, 2^129598138 is an apocalyptic number.

129598138 is a deficient number, since it is larger than the sum of its proper divisors (64799072).

129598138 is an equidigital number, since it uses as much as digits as its factorization.

129598138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64799071.

The product of its digits is 155520, while the sum is 46.

The square root of 129598138 is about 11384.1177962985. The cubic root of 129598138 is about 506.0571756021.

The spelling of 129598138 in words is "one hundred twenty-nine million, five hundred ninety-eight thousand, one hundred thirty-eight".