129538458 has 72 divisors (see below), whose sum is σ = 328434912. Its totient is φ = 36790992.

The previous prime is 129538457. The next prime is 129538469. The reversal of 129538458 is 854835921.

It is not an unprimeable number, because it can be changed into a prime (129538457) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 199891 + ... + 200537.

It is an arithmetic number, because the mean of its divisors is an integer number (4561596).

Almost surely, 2^129538458 is an apocalyptic number.

129538458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129538458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164217456).

129538458 is an abundant number, since it is smaller than the sum of its proper divisors (198896454).

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

129538458 is a wasteful number, since it uses less digits than its factorization.

129538458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896 (or 886 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 129538458 is about 11381.4962988177. The cubic root of 129538458 is about 505.9794838240.

The spelling of 129538458 in words is "one hundred twenty-nine million, five hundred thirty-eight thousand, four hundred fifty-eight".