129686976 has 84 divisors (see below), whose sum is σ = 377920504. Its totient is φ = 42508800.

The previous prime is 129686971. The next prime is 129686993. The reversal of 129686976 is 679686921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129686971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33291 + ... + 36981.

Almost surely, 2^129686976 is an apocalyptic number.

129686976 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 129686976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188960252).

129686976 is an abundant number, since it is smaller than the sum of its proper divisors (248233528).

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

129686976 is a wasteful number, since it uses less digits than its factorization.

129686976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770 (or 3757 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 129686976 is about 11388.0189673182. The cubic root of 129686976 is about 506.1727812722.

Subtracting 129686976 from its reverse (679686921), we obtain a palindrome (549999945).

The spelling of 129686976 in words is "one hundred twenty-nine million, six hundred eighty-six thousand, nine hundred seventy-six".