129941680 has 40 divisors (see below), whose sum is σ = 329581584. Its totient is φ = 47251200.

The previous prime is 129941641. The next prime is 129941681. The reversal of 129941680 is 86149921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (129941681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72951 + ... + 74710.

Almost surely, 2^129941680 is an apocalyptic number.

129941680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129941680 is an abundant number, since it is smaller than the sum of its proper divisors (199639904).

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

129941680 is a wasteful number, since it uses less digits than its factorization.

129941680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147685 (or 147679 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 129941680 is about 11399.1964629091. The cubic root of 129941680 is about 506.5039374300.

The spelling of 129941680 in words is "one hundred twenty-nine million, nine hundred forty-one thousand, six hundred eighty".