129407399 has 4 divisors (see below), whose sum is σ = 141171720. Its totient is φ = 117643080.

The previous prime is 129407393. The next prime is 129407431. The reversal of 129407399 is 993704921.

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 129407399 - 2⁸ = 129407143 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 (129407393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5882144 + ... + 5882165.

It is an arithmetic number, because the mean of its divisors is an integer number (35292930).

Almost surely, 2^129407399 is an apocalyptic number.

129407399 is a deficient number, since it is larger than the sum of its proper divisors (11764321).

129407399 is a wasteful number, since it uses less digits than its factorization.

129407399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11764320.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 129407399 is about 11375.7372947867. The cubic root of 129407399 is about 505.8087866616.

The spelling of 129407399 in words is "one hundred twenty-nine million, four hundred seven thousand, three hundred ninety-nine".