129494129394840 has 512 divisors, whose sum is σ = 455882807992320. Its totient is φ = 28814046363648.

The previous prime is 129494129394767. The next prime is 129494129394857. The reversal of 129494129394840 is 48493921494921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 16876593244 + ... + 16876600916.

It is an arithmetic number, because the mean of its divisors is an integer number (890396109360).

Almost surely, 2^{129494129394840} is an apocalyptic number.

129494129394840 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 129494129394840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227941403996160).

129494129394840 is an abundant number, since it is smaller than the sum of its proper divisors (326388678597480).

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

129494129394840 is a wasteful number, since it uses less digits than its factorization.

129494129394840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10651 (or 10647 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 69.

The spelling of 129494129394840 in words is "one hundred twenty-nine trillion, four hundred ninety-four billion, one hundred twenty-nine million, three hundred ninety-four thousand, eight hundred forty".