689398243 has 8 divisors (see below), whose sum is σ = 712423296. Its totient is φ = 666422400.

The previous prime is 689398217. The next prime is 689398289. The reversal of 689398243 is 342893986.

689398243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689398243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689392243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17355 + ... + 40987.

It is an arithmetic number, because the mean of its divisors is an integer number (89052912).

Almost surely, 2^689398243 is an apocalyptic number.

689398243 is a deficient number, since it is larger than the sum of its proper divisors (23025053).

689398243 is a wasteful number, since it uses less digits than its factorization.

689398243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24605.

The product of its digits is 2239488, while the sum is 52.

The square root of 689398243 is about 26256.3943259542. The cubic root of 689398243 is about 883.3986354318.

The spelling of 689398243 in words is "six hundred eighty-nine million, three hundred ninety-eight thousand, two hundred forty-three".