129147844 has 48 divisors (see below), whose sum is σ = 275184000. Its totient is φ = 51770880.

The previous prime is 129147833. The next prime is 129147847. The reversal of 129147844 is 448741921.

It is a junction number, because it is equal to n+sod(n) for n = 129147797 and 129147806.

It is not an unprimeable number, because it can be changed into a prime (129147847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85407 + ... + 86905.

It is an arithmetic number, because the mean of its divisors is an integer number (5733000).

Almost surely, 2^129147844 is an apocalyptic number.

129147844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129147844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137592000).

129147844 is an abundant number, since it is smaller than the sum of its proper divisors (146036156).

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

129147844 is a wasteful number, since it uses less digits than its factorization.

129147844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708 (or 1706 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 129147844 is about 11364.3232970556. The cubic root of 129147844 is about 505.4703900620.

The spelling of 129147844 in words is "one hundred twenty-nine million, one hundred forty-seven thousand, eight hundred forty-four".