129993866 has 8 divisors (see below), whose sum is σ = 206460900. Its totient is φ = 61173568.

The previous prime is 129993847. The next prime is 129993889. The reversal of 129993866 is 668399921.

It can be written as a sum of positive squares in 2 ways, for example, as 119268241 + 10725625 = 10921^2 + 3275^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1911641 + ... + 1911708.

Almost surely, 2^129993866 is an apocalyptic number.

129993866 is a deficient number, since it is larger than the sum of its proper divisors (76467034).

129993866 is a wasteful number, since it uses less digits than its factorization.

129993866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823368.

The product of its digits is 1259712, while the sum is 53.

The square root of 129993866 is about 11401.4852541237. The cubic root of 129993866 is about 506.5717341953.

The spelling of 129993866 in words is "one hundred twenty-nine million, nine hundred ninety-three thousand, eight hundred sixty-six".