129368399 has 4 divisors (see below), whose sum is σ = 134993136. Its totient is φ = 123743664.

The previous prime is 129368383. The next prime is 129368401. The reversal of 129368399 is 993863921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129368399 - 2⁴ = 129368383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129368339) 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, 2812334 + ... + 2812379.

It is an arithmetic number, because the mean of its divisors is an integer number (33748284).

Almost surely, 2^129368399 is an apocalyptic number.

129368399 is a deficient number, since it is larger than the sum of its proper divisors (5624737).

129368399 is an equidigital number, since it uses as much as digits as its factorization.

129368399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624736.

The product of its digits is 629856, while the sum is 50.

The square root of 129368399 is about 11374.0229910089. The cubic root of 129368399 is about 505.7579690503.

The spelling of 129368399 in words is "one hundred twenty-nine million, three hundred sixty-eight thousand, three hundred ninety-nine".