129840965 has 8 divisors (see below), whose sum is σ = 164009760. Its totient is φ = 98405712.

The previous prime is 129840961. The next prime is 129840983. The reversal of 129840965 is 569048921.

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

It is not a de Polignac number, because 129840965 - 2² = 129840961 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129840961) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 683279 + ... + 683468.

It is an arithmetic number, because the mean of its divisors is an integer number (20501220).

Almost surely, 2^129840965 is an apocalyptic number.

It is an amenable number.

129840965 is a deficient number, since it is larger than the sum of its proper divisors (34168795).

129840965 is a wasteful number, since it uses less digits than its factorization.

129840965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366771.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 129840965 is about 11394.7779706320. Note that the first 3 decimals coincide. The cubic root of 129840965 is about 506.3730435056.

The spelling of 129840965 in words is "one hundred twenty-nine million, eight hundred forty thousand, nine hundred sixty-five".