129180986 has 16 divisors (see below), whose sum is σ = 217101600. Its totient is φ = 57131280.

The previous prime is 129180973. The next prime is 129180991. The reversal of 129180986 is 689081921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78536 + ... + 80163.

It is an arithmetic number, because the mean of its divisors is an integer number (13568850).

Almost surely, 2^129180986 is an apocalyptic number.

129180986 is a deficient number, since it is larger than the sum of its proper divisors (87920614).

129180986 is a wasteful number, since it uses less digits than its factorization.

129180986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158749.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 129180986 is about 11365.7813633731. The cubic root of 129180986 is about 505.5136244058.

The spelling of 129180986 in words is "one hundred twenty-nine million, one hundred eighty thousand, nine hundred eighty-six".