129876240 has 80 divisors (see below), whose sum is σ = 433597248. Its totient is φ = 31968768.

The previous prime is 129876223. The next prime is 129876251. The reversal of 129876240 is 42678921.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (39).

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 15 ways as a sum of consecutive naturals, for example, 17694 + ... + 23933.

Almost surely, 2^129876240 is an apocalyptic number.

129876240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129876240 is an abundant number, since it is smaller than the sum of its proper divisors (303721008).

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

129876240 is a wasteful number, since it uses less digits than its factorization.

129876240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41656 (or 41650 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 129876240 is about 11396.3257236708. The cubic root of 129876240 is about 506.4188962449.

The spelling of 129876240 in words is "one hundred twenty-nine million, eight hundred seventy-six thousand, two hundred forty".