129905319 has 8 divisors (see below), whose sum is σ = 173320432. Its totient is φ = 86546880.

The previous prime is 129905317. The next prime is 129905323. The reversal of 129905319 is 913509921.

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

It is not a de Polignac number, because 129905319 - 2¹ = 129905317 is a prime.

It is a super-2 number, since 2×129905319² = 33750783808983522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129905317) 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, 8494 + ... + 18219.

It is an arithmetic number, because the mean of its divisors is an integer number (21665054).

Almost surely, 2^129905319 is an apocalyptic number.

129905319 is a deficient number, since it is larger than the sum of its proper divisors (43415113).

129905319 is a wasteful number, since it uses less digits than its factorization.

129905319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28337.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 129905319 is about 11397.6014582016. The cubic root of 129905319 is about 506.4566887777.

The spelling of 129905319 in words is "one hundred twenty-nine million, nine hundred five thousand, three hundred nineteen".