129840479 has 8 divisors (see below), whose sum is σ = 130953792. Its totient is φ = 128731680.

The previous prime is 129840443. The next prime is 129840499. The reversal of 129840479 is 974048921.

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 129840479 - 2¹² = 129836383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129840419) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 79289 + ... + 80909.

It is an arithmetic number, because the mean of its divisors is an integer number (16369224).

Almost surely, 2^129840479 is an apocalyptic number.

129840479 is a deficient number, since it is larger than the sum of its proper divisors (1113313).

129840479 is a wasteful number, since it uses less digits than its factorization.

129840479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 129840479 is about 11394.7566450539. The cubic root of 129840479 is about 506.3724117132.

The spelling of 129840479 in words is "one hundred twenty-nine million, eight hundred forty thousand, four hundred seventy-nine".