856942 has 4 divisors (see below), whose sum is σ = 1285416. Its totient is φ = 428470.

The previous prime is 856939. The next prime is 856943. The reversal of 856942 is 249658.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 856898 and 856907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856943) by changing a digit.

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 as a sum of consecutive naturals, namely, 214234 + ... + 214237.

It is an arithmetic number, because the mean of its divisors is an integer number (321354).

2⁸⁵⁶⁹⁴² is an apocalyptic number.

856942 is a deficient number, since it is larger than the sum of its proper divisors (428474).

856942 is a wasteful number, since it uses less digits than its factorization.

856942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428473.

The product of its digits is 17280, while the sum is 34.

The square root of 856942 is about 925.7116181619. The cubic root of 856942 is about 94.9840046939.

The spelling of 856942 in words is "eight hundred fifty-six thousand, nine hundred forty-two".