129826140 has 96 divisors (see below), whose sum is σ = 378126336. Its totient is φ = 33246720.

The previous prime is 129826133. The next prime is 129826157. The reversal of 129826140 is 41628921.

129826140 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

129826140 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414624 + ... + 414936.

It is an arithmetic number, because the mean of its divisors is an integer number (3938816).

Almost surely, 2^129826140 is an apocalyptic number.

129826140 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 129826140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189063168).

129826140 is an abundant number, since it is smaller than the sum of its proper divisors (248300196).

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

129826140 is a wasteful number, since it uses less digits than its factorization.

129826140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 129826140 is about 11394.1274347797. The cubic root of 129826140 is about 506.3537705278.

The spelling of 129826140 in words is "one hundred twenty-nine million, eight hundred twenty-six thousand, one hundred forty".