857243 has 4 divisors (see below), whose sum is σ = 884928. Its totient is φ = 829560.

The previous prime is 857221. The next prime is 857249. The reversal of 857243 is 342758.

It is a happy number.

857243 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 is not a de Polignac number, because 857243 - 2¹⁴ = 840859 is a prime.

It is a super-2 number, since 2×857243² = 1469731122098, which contains 22 as substring.

It is a d-powerful number, because it can be written as 8² + 5⁴ + 2¹⁴ + 7⁷ + 4⁷ + 3⁵ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857249) 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, 13796 + ... + 13857.

It is an arithmetic number, because the mean of its divisors is an integer number (221232).

2⁸⁵⁷²⁴³ is an apocalyptic number.

857243 is a deficient number, since it is larger than the sum of its proper divisors (27685).

857243 is a wasteful number, since it uses less digits than its factorization.

857243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27684.

The product of its digits is 6720, while the sum is 29.

The square root of 857243 is about 925.8741815171. The cubic root of 857243 is about 94.9951244035.

The spelling of 857243 in words is "eight hundred fifty-seven thousand, two hundred forty-three".