129994656 has 216 divisors, whose sum is σ = 408627072. Its totient is φ = 36115200.

The previous prime is 129994651. The next prime is 129994679. The reversal of 129994656 is 656499921.

It is a super-2 number, since 2×129994656² = 33797221177116672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129994599 and 129994608.

It is not an unprimeable number, because it can be changed into a prime (129994651) 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 35 ways as a sum of consecutive naturals, for example, 4193361 + ... + 4193391.

It is an arithmetic number, because the mean of its divisors is an integer number (1891792).

Almost surely, 2^129994656 is an apocalyptic number.

129994656 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 129994656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204313536).

129994656 is an abundant number, since it is smaller than the sum of its proper divisors (278632416).

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

129994656 is a wasteful number, since it uses less digits than its factorization.

129994656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 66 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 51.

The square root of 129994656 is about 11401.5198986802. The cubic root of 129994656 is about 506.5727603741.

The spelling of 129994656 in words is "one hundred twenty-nine million, nine hundred ninety-four thousand, six hundred fifty-six".