685942 has 4 divisors (see below), whose sum is σ = 1028916. Its totient is φ = 342970.

The previous prime is 685939. The next prime is 685963. The reversal of 685942 is 249586.

It is a happy number.

685942 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249586 = 2 ⋅124793.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁶ + 8⁵ + 9 + 5⁷ + 4⁶ + 2¹⁹ .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 685898 and 685907.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171484 + ... + 171487.

It is an arithmetic number, because the mean of its divisors is an integer number (257229).

2⁶⁸⁵⁹⁴² is an apocalyptic number.

685942 is a deficient number, since it is larger than the sum of its proper divisors (342974).

685942 is a wasteful number, since it uses less digits than its factorization.

685942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342973.

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

The square root of 685942 is about 828.2161553604. The cubic root of 685942 is about 88.1919878641.

The spelling of 685942 in words is "six hundred eighty-five thousand, nine hundred forty-two".