129840043 has 8 divisors (see below), whose sum is σ = 132005376. Its totient is φ = 127684200.

The previous prime is 129840013. The next prime is 129840077. The reversal of 129840043 is 340048921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129840043 - 2²¹ = 127742891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129839987 and 129840014.

It is not an unprimeable number, because it can be changed into a prime (129840013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28480 + ... + 32722.

It is an arithmetic number, because the mean of its divisors is an integer number (16500672).

Almost surely, 2^129840043 is an apocalyptic number.

129840043 is a deficient number, since it is larger than the sum of its proper divisors (2165333).

129840043 is an equidigital number, since it uses as much as digits as its factorization.

129840043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4745.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 129840043 is about 11394.7375134314. The cubic root of 129840043 is about 506.3718449187.

Adding to 129840043 its reverse (340048921), we get a palindrome (469888964).

The spelling of 129840043 in words is "one hundred twenty-nine million, eight hundred forty thousand, forty-three".