689423047 has 2 divisors, whose sum is σ = 689423048. Its totient is φ = 689423046.

The previous prime is 689423029. The next prime is 689423051. The reversal of 689423047 is 740324986.

689423047 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689423047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689422994 and 689423012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689423087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344711523 + 344711524.

It is an arithmetic number, because the mean of its divisors is an integer number (344711524).

Almost surely, 2^689423047 is an apocalyptic number.

689423047 is a deficient number, since it is larger than the sum of its proper divisors (1).

689423047 is an equidigital number, since it uses as much as digits as its factorization.

689423047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 689423047 is about 26256.8666637891. The cubic root of 689423047 is about 883.4092299646.

The spelling of 689423047 in words is "six hundred eighty-nine million, four hundred twenty-three thousand, forty-seven".