689245 has 4 divisors (see below), whose sum is σ = 827100. Its totient is φ = 551392.

The previous prime is 689237. The next prime is 689257. The reversal of 689245 is 542986.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 438244 + 251001 = 662^2 + 501^2 .

It is a cyclic number.

It is not a de Polignac number, because 689245 - 2³ = 689237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68920 + ... + 68929.

It is an arithmetic number, because the mean of its divisors is an integer number (206775).

2⁶⁸⁹²⁴⁵ is an apocalyptic number.

It is an amenable number.

689245 is a deficient number, since it is larger than the sum of its proper divisors (137855).

689245 is a wasteful number, since it uses less digits than its factorization.

689245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137854.

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

The square root of 689245 is about 830.2078053114. The cubic root of 689245 is about 88.3333175112. Note that the first 4 decimals are identical.

The spelling of 689245 in words is "six hundred eighty-nine thousand, two hundred forty-five".