129435634 has 16 divisors (see below), whose sum is σ = 195989976. Its totient is φ = 64108800.

The previous prime is 129435623. The next prime is 129435689. The reversal of 129435634 is 436534921.

It can be written as a sum of positive squares in 4 ways, for example, as 66471409 + 62964225 = 8153^2 + 7935^2 .

It is a junction number, because it is equal to n+sod(n) for n = 129435593 and 129435602.

It is an unprimeable number.

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, 121464 + ... + 122524.

Almost surely, 2^129435634 is an apocalyptic number.

129435634 is a deficient number, since it is larger than the sum of its proper divisors (66554342).

129435634 is a wasteful number, since it uses less digits than its factorization.

129435634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581.

The product of its digits is 77760, while the sum is 37.

The square root of 129435634 is about 11376.9782455624. The cubic root of 129435634 is about 505.8455709378.

The spelling of 129435634 in words is "one hundred twenty-nine million, four hundred thirty-five thousand, six hundred thirty-four".