399129829 has 8 divisors (see below), whose sum is σ = 456431360. Its totient is φ = 341899056.

The previous prime is 399129811. The next prime is 399129839. The reversal of 399129829 is 928921993.

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

It is a cyclic number.

It is not a de Polignac number, because 399129829 - 2⁹ = 399129317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399129839) 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 7 ways as a sum of consecutive naturals, for example, 4989 + ... + 28690.

It is an arithmetic number, because the mean of its divisors is an integer number (57053920).

Almost surely, 2^399129829 is an apocalyptic number.

It is an amenable number.

399129829 is a deficient number, since it is larger than the sum of its proper divisors (57301531).

399129829 is a wasteful number, since it uses less digits than its factorization.

399129829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35379.

The product of its digits is 629856, while the sum is 52.

The square root of 399129829 is about 19978.2338809015. The cubic root of 399129829 is about 736.2716222609.

The spelling of 399129829 in words is "three hundred ninety-nine million, one hundred twenty-nine thousand, eight hundred twenty-nine".