129825838 has 8 divisors (see below), whose sum is σ = 206194032. Its totient is φ = 61094496.

The previous prime is 129825811. The next prime is 129825851. The reversal of 129825838 is 838528921.

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

It is a congruent number.

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, 1909170 + ... + 1909237.

It is an arithmetic number, because the mean of its divisors is an integer number (25774254).

Almost surely, 2^129825838 is an apocalyptic number.

129825838 is a deficient number, since it is larger than the sum of its proper divisors (76368194).

129825838 is a wasteful number, since it uses less digits than its factorization.

129825838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818426.

The product of its digits is 276480, while the sum is 46.

The square root of 129825838 is about 11394.1141823312. The cubic root of 129825838 is about 506.3533779028.

The spelling of 129825838 in words is "one hundred twenty-nine million, eight hundred twenty-five thousand, eight hundred thirty-eight".