129620818 has 16 divisors (see below), whose sum is σ = 206129664. Its totient is φ = 60920640.

The previous prime is 129620779. The next prime is 129620819. The reversal of 129620818 is 818026921.

It is not an unprimeable number, because it can be changed into a prime (129620819) 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, 31771 + ... + 35617.

It is an arithmetic number, because the mean of its divisors is an integer number (12883104).

Almost surely, 2^129620818 is an apocalyptic number.

129620818 is a deficient number, since it is larger than the sum of its proper divisors (76508846).

129620818 is a wasteful number, since it uses less digits than its factorization.

129620818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4857.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 129620818 is about 11385.1138773400. The cubic root of 129620818 is about 506.0866943063.

The spelling of 129620818 in words is "one hundred twenty-nine million, six hundred twenty thousand, eight hundred eighteen".