857242 has 16 divisors (see below), whose sum is σ = 1434240. Its totient is φ = 381888.

The previous prime is 857221. The next prime is 857249. The reversal of 857242 is 242758.

It is a self number, because there is not a number n which added to its sum of digits gives 857242.

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 7 ways as a sum of consecutive naturals, for example, 18 + ... + 1309.

It is an arithmetic number, because the mean of its divisors is an integer number (89640).

2⁸⁵⁷²⁴² is an apocalyptic number.

857242 is a deficient number, since it is larger than the sum of its proper divisors (576998).

857242 is a wasteful number, since it uses less digits than its factorization.

857242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365.

The product of its digits is 4480, while the sum is 28.

The square root of 857242 is about 925.8736414868. The cubic root of 857242 is about 94.9950874653.

The spelling of 857242 in words is "eight hundred fifty-seven thousand, two hundred forty-two".