8157985 has 16 divisors (see below), whose sum is σ = 11145600. Its totient is φ = 5674240.

The previous prime is 8157979. The next prime is 8158013. The reversal of 8157985 is 5897518.

It is not a de Polignac number, because 8157985 - 2⁷ = 8157857 is a prime.

It is an Ulam number.

8157985 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1960 + ... + 4489.

It is an arithmetic number, because the mean of its divisors is an integer number (696600).

Almost surely, 2^8157985 is an apocalyptic number.

It is an amenable number.

8157985 is a deficient number, since it is larger than the sum of its proper divisors (2987615).

8157985 is a wasteful number, since it uses less digits than its factorization.

8157985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488.

The product of its digits is 100800, while the sum is 43.

The square root of 8157985 is about 2856.2186540950. The cubic root of 8157985 is about 201.3079691037.

The spelling of 8157985 in words is "eight million, one hundred fifty-seven thousand, nine hundred eighty-five".