129992544 has 144 divisors (see below), whose sum is σ = 414545040. Its totient is φ = 38292480.

The previous prime is 129992543. The next prime is 129992549. The reversal of 129992544 is 445299921.

129992544 is a `hidden beast` number, since 12 + 9 + 9 + 92 + 544 = 666.

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

It is a super-2 number, since 2×129992544² = 33796122991183872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129992544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129992543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116662 + ... + 117770.

It is an arithmetic number, because the mean of its divisors is an integer number (2878785).

Almost surely, 2^129992544 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 129992544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207272520).

129992544 is an abundant number, since it is smaller than the sum of its proper divisors (284552496).

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

129992544 is a wasteful number, since it uses less digits than its factorization.

129992544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1162 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 129992544 is about 11401.4272790734. The cubic root of 129992544 is about 506.5700169602.

The spelling of 129992544 in words is "one hundred twenty-nine million, nine hundred ninety-two thousand, five hundred forty-four".