129271338 has 96 divisors (see below), whose sum is σ = 332107776. Its totient is φ = 35577504.

The previous prime is 129271321. The next prime is 129271367. The reversal of 129271338 is 833172921.

It is a super-2 number, since 2×129271338² = 33422157656620488, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 491395 + ... + 491657.

It is an arithmetic number, because the mean of its divisors is an integer number (3459456).

Almost surely, 2^129271338 is an apocalyptic number.

129271338 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 129271338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166053888).

129271338 is an abundant number, since it is smaller than the sum of its proper divisors (202836438).

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

129271338 is a wasteful number, since it uses less digits than its factorization.

129271338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 405 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 129271338 is about 11369.7554063401. The cubic root of 129271338 is about 505.6314526922.

The spelling of 129271338 in words is "one hundred twenty-nine million, two hundred seventy-one thousand, three hundred thirty-eight".