129854839 has 4 divisors (see below), whose sum is σ = 130527856. Its totient is φ = 129181824.

The previous prime is 129854821. The next prime is 129854869. The reversal of 129854839 is 938458921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129854839 - 2⁵ = 129854807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129854792 and 129854801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129854869) 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, 336219 + ... + 336604.

It is an arithmetic number, because the mean of its divisors is an integer number (32631964).

Almost surely, 2^129854839 is an apocalyptic number.

129854839 is a deficient number, since it is larger than the sum of its proper divisors (673017).

129854839 is an equidigital number, since it uses as much as digits as its factorization.

129854839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673016.

The product of its digits is 622080, while the sum is 49.

The square root of 129854839 is about 11395.3867420110. The cubic root of 129854839 is about 506.3910788239.

The spelling of 129854839 in words is "one hundred twenty-nine million, eight hundred fifty-four thousand, eight hundred thirty-nine".