129785018 has 16 divisors (see below), whose sum is σ = 215369280. Its totient is φ = 58161600.

The previous prime is 129785017. The next prime is 129785027. The reversal of 129785018 is 810587921.

It is not an unprimeable number, because it can be changed into a prime (129785017) 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, 39983 + ... + 43106.

It is an arithmetic number, because the mean of its divisors is an integer number (13460580).

Almost surely, 2^129785018 is an apocalyptic number.

129785018 is a deficient number, since it is larger than the sum of its proper divisors (85584262).

129785018 is a wasteful number, since it uses less digits than its factorization.

129785018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83173.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 129785018 is about 11392.3227657928. The cubic root of 129785018 is about 506.3003029221.

The spelling of 129785018 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, eighteen".