689406 has 8 divisors (see below), whose sum is σ = 1378824. Its totient is φ = 229800.

The previous prime is 689393. The next prime is 689411. The reversal of 689406 is 604986.

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

689406 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

689406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 57445 + ... + 57456.

It is an arithmetic number, because the mean of its divisors is an integer number (172353).

2⁶⁸⁹⁴⁰⁶ is an apocalyptic number.

689406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

689406 is a wasteful number, since it uses less digits than its factorization.

689406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114906.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 689406 is about 830.3047633249. The cubic root of 689406 is about 88.3401948707.

The spelling of 689406 in words is "six hundred eighty-nine thousand, four hundred six".