129441866 has 8 divisors (see below), whose sum is σ = 194219364. Its totient is φ = 64702080.

The previous prime is 129441857. The next prime is 129441869. The reversal of 129441866 is 668144921.

It can be written as a sum of positive squares in 2 ways, for example, as 74459641 + 54982225 = 8629^2 + 7415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (129441869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1856 + ... + 16196.

Almost surely, 2^129441866 is an apocalyptic number.

129441866 is a deficient number, since it is larger than the sum of its proper divisors (64777498).

129441866 is a wasteful number, since it uses less digits than its factorization.

129441866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18856.

The product of its digits is 82944, while the sum is 41.

The square root of 129441866 is about 11377.2521286996. The cubic root of 129441866 is about 505.8536892046.

The spelling of 129441866 in words is "one hundred twenty-nine million, four hundred forty-one thousand, eight hundred sixty-six".