129318992 has 30 divisors (see below), whose sum is σ = 275408154. Its totient is φ = 58780480.

The previous prime is 129318953. The next prime is 129319007. The reversal of 129318992 is 299813921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 94556176 + 34762816 = 9724^2 + 5896^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31463 + ... + 35334.

Almost surely, 2^129318992 is an apocalyptic number.

It is an amenable number.

129318992 is an abundant number, since it is smaller than the sum of its proper divisors (146089162).

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

129318992 is a wasteful number, since it uses less digits than its factorization.

129318992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66827 (or 66810 counting only the distinct ones).

The product of its digits is 69984, while the sum is 44.

The square root of 129318992 is about 11371.8508607878. The cubic root of 129318992 is about 505.6935762880.

The spelling of 129318992 in words is "one hundred twenty-nine million, three hundred eighteen thousand, nine hundred ninety-two".