129215966 has 16 divisors (see below), whose sum is σ = 213541488. Its totient is φ = 58152000.

The previous prime is 129215939. The next prime is 129215981. The reversal of 129215966 is 669512921.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 26855 + ... + 31298.

It is an arithmetic number, because the mean of its divisors is an integer number (13346343).

Almost surely, 2^129215966 is an apocalyptic number.

129215966 is a deficient number, since it is larger than the sum of its proper divisors (84325522).

129215966 is a wasteful number, since it uses less digits than its factorization.

129215966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58267.

The product of its digits is 58320, while the sum is 41.

The square root of 129215966 is about 11367.3200887456. The cubic root of 129215966 is about 505.5592484338.

The spelling of 129215966 in words is "one hundred twenty-nine million, two hundred fifteen thousand, nine hundred sixty-six".