129840084 has 120 divisors (see below), whose sum is σ = 392249088. Its totient is φ = 37013760.

The previous prime is 129840077. The next prime is 129840119. The reversal of 129840084 is 480048921.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 39 ways as a sum of consecutive naturals, for example, 59517 + ... + 61659.

Almost surely, 2^129840084 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129840084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196124544).

129840084 is an abundant number, since it is smaller than the sum of its proper divisors (262409004).

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

129840084 is a wasteful number, since it uses less digits than its factorization.

129840084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187 (or 2176 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 129840084 is about 11394.7393125073. The cubic root of 129840084 is about 506.3718982182.

The spelling of 129840084 in words is "one hundred twenty-nine million, eight hundred forty thousand, eighty-four".