129578238 has 16 divisors (see below), whose sum is σ = 287951760. Its totient is φ = 43192728.

The previous prime is 129578203. The next prime is 129578243. The reversal of 129578238 is 832875921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129578193 and 129578202.

It is a congruent number.

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, 1199745 + ... + 1199852.

It is an arithmetic number, because the mean of its divisors is an integer number (17996985).

Almost surely, 2^129578238 is an apocalyptic number.

129578238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

129578238 is an abundant number, since it is smaller than the sum of its proper divisors (158373522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129578238 is a wasteful number, since it uses less digits than its factorization.

129578238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399608 (or 2399602 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 129578238 is about 11383.2437380564. The cubic root of 129578238 is about 506.0312723151.

The spelling of 129578238 in words is "one hundred twenty-nine million, five hundred seventy-eight thousand, two hundred thirty-eight".