129838555 has 32 divisors (see below), whose sum is σ = 195084288. Its totient is φ = 80592000.

The previous prime is 129838523. The next prime is 129838591. The reversal of 129838555 is 555838921.

129838555 is a nontrivial binomial coefficient, being equal to C(16115, 2).

It is not a de Polignac number, because 129838555 - 2⁵ = 129838523 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 112230 + ... + 113380.

It is an arithmetic number, because the mean of its divisors is an integer number (6096384).

Almost surely, 2^129838555 is an apocalyptic number.

129838555 is the 16114-th triangular number.

129838555 is the 5372-nd centered nonagonal number.

129838555 is a deficient number, since it is larger than the sum of its proper divisors (65245733).

129838555 is a wasteful number, since it uses less digits than its factorization.

129838555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467.

The product of its digits is 432000, while the sum is 46.

The square root of 129838555 is about 11394.6722199456. The cubic root of 129838555 is about 506.3699105278.

The spelling of 129838555 in words is "one hundred twenty-nine million, eight hundred thirty-eight thousand, five hundred fifty-five".