689387 has 4 divisors (see below), whose sum is σ = 693936. Its totient is φ = 684840.

The previous prime is 689383. The next prime is 689389. The reversal of 689387 is 783986.

689387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 689387 - 2² = 689383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689383) 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, 2039 + ... + 2352.

It is an arithmetic number, because the mean of its divisors is an integer number (173484).

2⁶⁸⁹³⁸⁷ is an apocalyptic number.

689387 is a deficient number, since it is larger than the sum of its proper divisors (4549).

689387 is a wasteful number, since it uses less digits than its factorization.

689387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548.

The product of its digits is 72576, while the sum is 41.

The square root of 689387 is about 830.2933216641. The cubic root of 689387 is about 88.3393833125.

The spelling of 689387 in words is "six hundred eighty-nine thousand, three hundred eighty-seven".