129809748 has 48 divisors (see below), whose sum is σ = 321413120. Its totient is φ = 40660704.

The previous prime is 129809747. The next prime is 129809783. The reversal of 129809748 is 847908921.

It is a junction number, because it is equal to n+sod(n) for n = 129809697 and 129809706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129809747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26715 + ... + 31197.

Almost surely, 2^129809748 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129809748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160706560).

129809748 is an abundant number, since it is smaller than the sum of its proper divisors (191603372).

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

129809748 is a wasteful number, since it uses less digits than its factorization.

129809748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636 (or 4634 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 129809748 is about 11393.4080941569. The cubic root of 129809748 is about 506.3324586914.

The spelling of 129809748 in words is "one hundred twenty-nine million, eight hundred nine thousand, seven hundred forty-eight".