129684845 has 8 divisors (see below), whose sum is σ = 159417720. Its totient is φ = 101217280.

The previous prime is 129684827. The next prime is 129684847. The reversal of 129684845 is 548486921.

It can be written as a sum of positive squares in 4 ways, for example, as 9278116 + 120406729 = 3046^2 + 10973^2 .

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

It is not a de Polignac number, because 129684845 - 2¹⁸ = 129422701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129684845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129684847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316100 + ... + 316509.

It is an arithmetic number, because the mean of its divisors is an integer number (19927215).

Almost surely, 2^129684845 is an apocalyptic number.

It is an amenable number.

129684845 is a deficient number, since it is larger than the sum of its proper divisors (29732875).

129684845 is an equidigital number, since it uses as much as digits as its factorization.

129684845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632655.

The product of its digits is 552960, while the sum is 47.

The square root of 129684845 is about 11387.9254036896. The cubic root of 129684845 is about 506.1700088013.

The spelling of 129684845 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, eight hundred forty-five".