129198868 has 12 divisors (see below), whose sum is σ = 226178260. Its totient is φ = 64576512.

The previous prime is 129198863. The next prime is 129198869. The reversal of 129198868 is 868891921.

It can be written as a sum of positive squares in 2 ways, for example, as 22448644 + 106750224 = 4738^2 + 10332^2 .

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129198863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16738 + ... + 23206.

Almost surely, 2^129198868 is an apocalyptic number.

It is an amenable number.

129198868 is a deficient number, since it is larger than the sum of its proper divisors (96979392).

129198868 is a wasteful number, since it uses less digits than its factorization.

129198868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11466 (or 11464 counting only the distinct ones).

The product of its digits is 497664, while the sum is 52.

The square root of 129198868 is about 11366.5679956617. The cubic root of 129198868 is about 505.5369487300.

The spelling of 129198868 in words is "one hundred twenty-nine million, one hundred ninety-eight thousand, eight hundred sixty-eight".