857993 has 4 divisors (see below), whose sum is σ = 881220. Its totient is φ = 834768.

The previous prime is 857981. The next prime is 858001. The reversal of 857993 is 399758.

857993 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 635209 + 222784 = 797^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 857993 - 2⁴ = 857977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 857993.

It is not an unprimeable number, because it can be changed into a prime (857903) 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, 11558 + ... + 11631.

It is an arithmetic number, because the mean of its divisors is an integer number (220305).

2⁸⁵⁷⁹⁹³ is an apocalyptic number.

It is an amenable number.

857993 is a deficient number, since it is larger than the sum of its proper divisors (23227).

857993 is a wasteful number, since it uses less digits than its factorization.

857993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23226.

The product of its digits is 68040, while the sum is 41.

The square root of 857993 is about 926.2791156018. The cubic root of 857993 is about 95.0228200027.

The spelling of 857993 in words is "eight hundred fifty-seven thousand, nine hundred ninety-three".