129919944 has 128 divisors (see below), whose sum is σ = 408038400. Its totient is φ = 33488640.

The previous prime is 129919943. The next prime is 129919961. The reversal of 129919944 is 449919921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129919893 and 129919902.

It is not an unprimeable number, because it can be changed into a prime (129919943) 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 31 ways as a sum of consecutive naturals, for example, 423039 + ... + 423345.

It is an arithmetic number, because the mean of its divisors is an integer number (3187800).

Almost surely, 2^129919944 is an apocalyptic number.

129919944 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 129919944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204019200).

129919944 is an abundant number, since it is smaller than the sum of its proper divisors (278118456).

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

129919944 is a wasteful number, since it uses less digits than its factorization.

129919944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 559 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 129919944 is about 11398.2430225013. The cubic root of 129919944 is about 506.4756940326.

The spelling of 129919944 in words is "one hundred twenty-nine million, nine hundred nineteen thousand, nine hundred forty-four".