857942 has 8 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 425944.

The previous prime is 857929. The next prime is 857951. The reversal of 857942 is 249758.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142 + ... + 1737.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

2⁸⁵⁷⁹⁴² is an apocalyptic number.

857942 is a deficient number, since it is larger than the sum of its proper divisors (438058).

857942 is a wasteful number, since it uses less digits than its factorization.

857942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030.

The product of its digits is 20160, while the sum is 35.

The square root of 857942 is about 926.2515856936. The cubic root of 857942 is about 95.0209372135.

The spelling of 857942 in words is "eight hundred fifty-seven thousand, nine hundred forty-two".