689713939 has 2 divisors, whose sum is σ = 689713940. Its totient is φ = 689713938.

The previous prime is 689713909. The next prime is 689713943. The reversal of 689713939 is 939317986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689713939 - 2¹³ = 689705747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689713939.

It is not a weakly prime, because it can be changed into another prime (689713909) 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 as a sum of consecutive naturals, namely, 344856969 + 344856970.

It is an arithmetic number, because the mean of its divisors is an integer number (344856970).

Almost surely, 2^689713939 is an apocalyptic number.

689713939 is a deficient number, since it is larger than the sum of its proper divisors (1).

689713939 is an equidigital number, since it uses as much as digits as its factorization.

689713939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 55.

The square root of 689713939 is about 26262.4054305770. The cubic root of 689713939 is about 883.5334597075.

The spelling of 689713939 in words is "six hundred eighty-nine million, seven hundred thirteen thousand, nine hundred thirty-nine".