689911 has 4 divisors (see below), whose sum is σ = 730512. Its totient is φ = 649312.

The previous prime is 689903. The next prime is 689917. The reversal of 689911 is 119986.

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

It is a cyclic number.

It is not a de Polignac number, because 689911 - 2³ = 689903 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20275 + ... + 20308.

It is an arithmetic number, because the mean of its divisors is an integer number (182628).

2⁶⁸⁹⁹¹¹ is an apocalyptic number.

689911 is a deficient number, since it is larger than the sum of its proper divisors (40601).

689911 is a wasteful number, since it uses less digits than its factorization.

689911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40600.

The product of its digits is 3888, while the sum is 34.

The square root of 689911 is about 830.6088128596. The cubic root of 689911 is about 88.3617597685.

It can be divided in two parts, 689 and 911, that added together give a square (1600 = 40²).

The spelling of 689911 in words is "six hundred eighty-nine thousand, nine hundred eleven".