129753840 has 80 divisors (see below), whose sum is σ = 410830848. Its totient is φ = 33861888.

The previous prime is 129753839. The next prime is 129753929. The reversal of 129753840 is 48357921.

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

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 15 ways as a sum of consecutive naturals, for example, 5529 + ... + 17031.

Almost surely, 2^129753840 is an apocalyptic number.

129753840 is a gapful number since it is divisible by the number (10) 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 129753840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205415424).

129753840 is an abundant number, since it is smaller than the sum of its proper divisors (281077008).

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

129753840 is a wasteful number, since it uses less digits than its factorization.

129753840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11566 (or 11560 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 129753840 is about 11390.9543059394. The cubic root of 129753840 is about 506.2597571660.

The spelling of 129753840 in words is "one hundred twenty-nine million, seven hundred fifty-three thousand, eight hundred forty".