129126996 has 72 divisors (see below), whose sum is σ = 335089664. Its totient is φ = 41912640.

The previous prime is 129126989. The next prime is 129127007. The reversal of 129126996 is 699621921.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278661 + ... + 279123.

Almost surely, 2^129126996 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 129126996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167544832).

129126996 is an abundant number, since it is smaller than the sum of its proper divisors (205962668).

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

129126996 is a wasteful number, since it uses less digits than its factorization.

129126996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661 (or 656 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 129126996 is about 11363.4060034833. The cubic root of 129126996 is about 505.4431896756.

The spelling of 129126996 in words is "one hundred twenty-nine million, one hundred twenty-six thousand, nine hundred ninety-six".