689639 has 8 divisors (see below), whose sum is σ = 738720. Its totient is φ = 641536.

The previous prime is 689629. The next prime is 689641. The reversal of 689639 is 936986.

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 689639 - 2⁸ = 689383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689596 and 689605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689629) 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 in 7 ways as a sum of consecutive naturals, for example, 1742 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (92340).

2⁶⁸⁹⁶³⁹ is an apocalyptic number.

689639 is a deficient number, since it is larger than the sum of its proper divisors (49081).

689639 is a wasteful number, since it uses less digits than its factorization.

689639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

The product of its digits is 69984, while the sum is 41.

The square root of 689639 is about 830.4450613978. The cubic root of 689639 is about 88.3501459237.

The spelling of 689639 in words is "six hundred eighty-nine thousand, six hundred thirty-nine".