129408479 has 4 divisors (see below), whose sum is σ = 130664976. Its totient is φ = 128151984.

The previous prime is 129408473. The next prime is 129408491. The reversal of 129408479 is 974804921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129408479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129408473) 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, 628094 + ... + 628299.

It is an arithmetic number, because the mean of its divisors is an integer number (32666244).

Almost surely, 2^129408479 is an apocalyptic number.

129408479 is a deficient number, since it is larger than the sum of its proper divisors (1256497).

129408479 is a wasteful number, since it uses less digits than its factorization.

129408479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256496.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 129408479 is about 11375.7847641383. The cubic root of 129408479 is about 505.8101937732.

The spelling of 129408479 in words is "one hundred twenty-nine million, four hundred eight thousand, four hundred seventy-nine".