129944736 has 144 divisors (see below), whose sum is σ = 406171584. Its totient is φ = 40725504.

The previous prime is 129944729. The next prime is 129944761. The reversal of 129944736 is 637449921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 129944691 and 129944700.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131701 + ... + 132683.

It is an arithmetic number, because the mean of its divisors is an integer number (2820636).

Almost surely, 2^129944736 is an apocalyptic number.

129944736 is a gapful number since it is divisible by the number (16) 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 129944736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203085792).

129944736 is an abundant number, since it is smaller than the sum of its proper divisors (276226848).

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

129944736 is an equidigital number, since it uses as much as digits as its factorization.

129944736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025 (or 1005 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 129944736 is about 11399.3305066570. The cubic root of 129944736 is about 506.5079080931.

The spelling of 129944736 in words is "one hundred twenty-nine million, nine hundred forty-four thousand, seven hundred thirty-six".