129185842 has 8 divisors (see below), whose sum is σ = 193827996. Its totient is φ = 64576512.

The previous prime is 129185827. The next prime is 129185867. The reversal of 129185842 is 248581921.

It can be written as a sum of positive squares in 2 ways, for example, as 126360081 + 2825761 = 11241^2 + 1681^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 129185795 and 129185804.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8178 + ... + 18034.

Almost surely, 2^129185842 is an apocalyptic number.

129185842 is a deficient number, since it is larger than the sum of its proper divisors (64642154).

129185842 is an equidigital number, since it uses as much as digits as its factorization.

129185842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16412.

The product of its digits is 46080, while the sum is 40.

The square root of 129185842 is about 11365.9949850420. The cubic root of 129185842 is about 505.5199585253.

The spelling of 129185842 in words is "one hundred twenty-nine million, one hundred eighty-five thousand, eight hundred forty-two".