129840443 has 2 divisors, whose sum is σ = 129840444. Its totient is φ = 129840442.

The previous prime is 129840419. The next prime is 129840499. The reversal of 129840443 is 344048921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129840443 - 2⁸ = 129840187 is a prime.

It is not a weakly prime, because it can be changed into another prime (129840343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64920221 + 64920222.

It is an arithmetic number, because the mean of its divisors is an integer number (64920222).

Almost surely, 2^129840443 is an apocalyptic number.

129840443 is a deficient number, since it is larger than the sum of its proper divisors (1).

129840443 is an equidigital number, since it uses as much as digits as its factorization.

129840443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 129840443 is about 11394.7550653799. The cubic root of 129840443 is about 506.3723649137.

The spelling of 129840443 in words is "one hundred twenty-nine million, eight hundred forty thousand, four hundred forty-three".