129424240 has 40 divisors (see below), whose sum is σ = 328269168. Its totient is φ = 47063040.

The previous prime is 129424223. The next prime is 129424271. The reversal of 129424240 is 42424921.

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

It is a junction number, because it is equal to n+sod(n) for n = 129424199 and 129424208.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 72657 + ... + 74416.

Almost surely, 2^129424240 is an apocalyptic number.

129424240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129424240 is an abundant number, since it is smaller than the sum of its proper divisors (198844928).

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

129424240 is a wasteful number, since it uses less digits than its factorization.

129424240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147097 (or 147091 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 129424240 is about 11376.4774864630. The cubic root of 129424240 is about 505.8307275922.

The spelling of 129424240 in words is "one hundred twenty-nine million, four hundred twenty-four thousand, two hundred forty".