9987857 has 8 divisors (see below), whose sum is σ = 11536992. Its totient is φ = 8545600.

The previous prime is 9987853. The next prime is 9987877. The reversal of 9987857 is 7587899.

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 9987857 - 2² = 9987853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9987799 and 9987808.

It is not an unprimeable number, because it can be changed into a prime (9987851) 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, 26519 + ... + 26892.

It is an arithmetic number, because the mean of its divisors is an integer number (1442124).

Almost surely, 2^9987857 is an apocalyptic number.

It is an amenable number.

9987857 is a deficient number, since it is larger than the sum of its proper divisors (1549135).

9987857 is a wasteful number, since it uses less digits than its factorization.

9987857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53439.

The product of its digits is 1270080, while the sum is 53.

The square root of 9987857 is about 3160.3571000759. The cubic root of 9987857 is about 215.3562293471.

The spelling of 9987857 in words is "nine million, nine hundred eighty-seven thousand, eight hundred fifty-seven".