857987 has 8 divisors (see below), whose sum is σ = 954240. Its totient is φ = 766080.

The previous prime is 857981. The next prime is 858001. The reversal of 857987 is 789758.

857987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 857987 - 2¹⁸ = 595843 is a prime.

It is a super-2 number, since 2×857987² = 1472283384338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857981) 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, 662 + ... + 1467.

It is an arithmetic number, because the mean of its divisors is an integer number (119280).

2⁸⁵⁷⁹⁸⁷ is an apocalyptic number.

857987 is a deficient number, since it is larger than the sum of its proper divisors (96253).

857987 is a wasteful number, since it uses less digits than its factorization.

857987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173.

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

The square root of 857987 is about 926.2758768315. The cubic root of 857987 is about 95.0225985020.

The spelling of 857987 in words is "eight hundred fifty-seven thousand, nine hundred eighty-seven".