129839479 has 16 divisors (see below), whose sum is σ = 164102400. Its totient is φ = 99783360.

The previous prime is 129839477. The next prime is 129839503. The reversal of 129839479 is 974938921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129839479 - 2¹ = 129839477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129839477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5929 + ... + 17170.

It is an arithmetic number, because the mean of its divisors is an integer number (10256400).

Almost surely, 2^129839479 is an apocalyptic number.

129839479 is a deficient number, since it is larger than the sum of its proper divisors (34262921).

129839479 is a wasteful number, since it uses less digits than its factorization.

129839479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23190.

The product of its digits is 979776, while the sum is 52.

The square root of 129839479 is about 11394.7127651380. The cubic root of 129839479 is about 506.3711117239.

The spelling of 129839479 in words is "one hundred twenty-nine million, eight hundred thirty-nine thousand, four hundred seventy-nine".