129696840 has 384 divisors, whose sum is σ = 537788160. Its totient is φ = 26376192.

The previous prime is 129696823. The next prime is 129696863. The reversal of 129696840 is 48696921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1212067 + ... + 1212173.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^129696840 is an apocalyptic number.

129696840 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 129696840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268894080).

129696840 is an abundant number, since it is smaller than the sum of its proper divisors (408091320).

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

129696840 is a wasteful number, since it uses less digits than its factorization.

129696840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 129696840 is about 11388.4520458226. The cubic root of 129696840 is about 506.1856141253.

The spelling of 129696840 in words is "one hundred twenty-nine million, six hundred ninety-six thousand, eight hundred forty".