857241 has 24 divisors (see below), whose sum is σ = 1545024. Its totient is φ = 444960.

The previous prime is 857221. The next prime is 857249. The reversal of 857241 is 142758.

It is not a de Polignac number, because 857241 - 2¹³ = 849049 is a prime.

It is a Curzon number.

857241 is a lucky 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 23 ways as a sum of consecutive naturals, for example, 75 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (64376).

2⁸⁵⁷²⁴¹ is an apocalyptic number.

It is an amenable number.

857241 is a deficient number, since it is larger than the sum of its proper divisors (687783).

857241 is a wasteful number, since it uses less digits than its factorization.

857241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261 (or 1258 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 857241 is about 925.8731014561. The cubic root of 857241 is about 94.9950505270.

Adding to 857241 its reverse (142758), we get a palindrome (999999).

The spelling of 857241 in words is "eight hundred fifty-seven thousand, two hundred forty-one".