689240 has 16 divisors (see below), whose sum is σ = 1550880. Its totient is φ = 275680.

The previous prime is 689237. The next prime is 689257. The reversal of 689240 is 42986.

689240 = 200² + 201² + ... + 215².

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8576 + ... + 8655.

It is an arithmetic number, because the mean of its divisors is an integer number (96930).

2⁶⁸⁹²⁴⁰ is an apocalyptic number.

It is an amenable number.

689240 is an abundant number, since it is smaller than the sum of its proper divisors (861640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689240 is a wasteful number, since it uses less digits than its factorization.

689240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17242 (or 17238 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 689240 is about 830.2047940117. The cubic root of 689240 is about 88.3331039114. Note that the first 3 decimals are identical.

It can be divided in two parts, 689 and 240, that added together give a palindrome (929).

The spelling of 689240 in words is "six hundred eighty-nine thousand, two hundred forty".