689438 has 4 divisors (see below), whose sum is σ = 1034160. Its totient is φ = 344718.

The previous prime is 689431. The next prime is 689441. The reversal of 689438 is 834986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834986 = 2 ⋅417493.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689438.

It is not an unprimeable number, because it can be changed into a prime (689431) by changing a digit.

689438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172358 + ... + 172361.

It is an arithmetic number, because the mean of its divisors is an integer number (258540).

2⁶⁸⁹⁴³⁸ is an apocalyptic number.

689438 is a deficient number, since it is larger than the sum of its proper divisors (344722).

689438 is a wasteful number, since it uses less digits than its factorization.

689438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344721.

The product of its digits is 41472, while the sum is 38.

The square root of 689438 is about 830.3240331341. The cubic root of 689438 is about 88.3415616717.

The spelling of 689438 in words is "six hundred eighty-nine thousand, four hundred thirty-eight".