987857 has 4 divisors (see below), whose sum is σ = 1063860. Its totient is φ = 911856.

The previous prime is 987851. The next prime is 987869. The reversal of 987857 is 758789.

987857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96721 + 891136 = 311^2 + 944^2 .

It is a cyclic number.

It is not a de Polignac number, because 987857 - 2⁶ = 987793 is a prime.

It is a super-2 number, since 2×987857² = 1951722904898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37982 + ... + 38007.

It is an arithmetic number, because the mean of its divisors is an integer number (265965).

2⁹⁸⁷⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

987857 is a deficient number, since it is larger than the sum of its proper divisors (76003).

987857 is a wasteful number, since it uses less digits than its factorization.

987857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76002.

The product of its digits is 141120, while the sum is 44.

The square root of 987857 is about 993.9099556801. The cubic root of 987857 is about 99.5935838299.

The spelling of 987857 in words is "nine hundred eighty-seven thousand, eight hundred fifty-seven".