8129985 has 8 divisors (see below), whose sum is σ = 13008000. Its totient is φ = 4335984.

The previous prime is 8129963. The next prime is 8129999. The reversal of 8129985 is 5899218.

It is a happy number.

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

It is not a de Polignac number, because 8129985 - 2⁶ = 8129921 is a prime.

It is a super-2 number, since 2×8129985² = 132193312200450, which contains 22 as substring.

8129985 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270985 + ... + 271014.

It is an arithmetic number, because the mean of its divisors is an integer number (1626000).

Almost surely, 2^8129985 is an apocalyptic number.

It is an amenable number.

8129985 is a deficient number, since it is larger than the sum of its proper divisors (4878015).

8129985 is a wasteful number, since it uses less digits than its factorization.

8129985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542007.

The product of its digits is 51840, while the sum is 42.

The square root of 8129985 is about 2851.3128555106. The cubic root of 8129985 is about 201.0773940221.

The spelling of 8129985 in words is "eight million, one hundred twenty-nine thousand, nine hundred eighty-five".