689919 has 8 divisors (see below), whose sum is σ = 926592. Its totient is φ = 456600.

The previous prime is 689917. The next prime is 689921. The reversal of 689919 is 919986.

It is an interprime number because it is at equal distance from previous prime (689917) and next prime (689921).

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

It is not a de Polignac number, because 689919 - 2¹ = 689917 is a prime.

It is a super-2 number, since 2×689919² = 951976453122, which contains 22 as substring.

689919 is a lucky number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309 + ... + 1214.

It is an arithmetic number, because the mean of its divisors is an integer number (115824).

2⁶⁸⁹⁹¹⁹ is an apocalyptic number.

689919 is a deficient number, since it is larger than the sum of its proper divisors (236673).

689919 is a wasteful number, since it uses less digits than its factorization.

689919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677.

The product of its digits is 34992, while the sum is 42.

The square root of 689919 is about 830.6136285903. The cubic root of 689919 is about 88.3621013060.

The spelling of 689919 in words is "six hundred eighty-nine thousand, nine hundred nineteen".