689857 has 8 divisors (see below), whose sum is σ = 795200. Its totient is φ = 586224.

The previous prime is 689851. The next prime is 689867. The reversal of 689857 is 758986.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 689857 - 2¹¹ = 687809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689851) 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, 619 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (99400).

2⁶⁸⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

689857 is a deficient number, since it is larger than the sum of its proper divisors (105343).

689857 is a wasteful number, since it uses less digits than its factorization.

689857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855.

The product of its digits is 120960, while the sum is 43.

The square root of 689857 is about 830.5763059467. The cubic root of 689857 is about 88.3594543216.

The spelling of 689857 in words is "six hundred eighty-nine thousand, eight hundred fifty-seven".