688583939 has 2 divisors, whose sum is σ = 688583940. Its totient is φ = 688583938.

The previous prime is 688583933. The next prime is 688583953. The reversal of 688583939 is 939385886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688583939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688583933) 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, 344291969 + 344291970.

It is an arithmetic number, because the mean of its divisors is an integer number (344291970).

Almost surely, 2^688583939 is an apocalyptic number.

688583939 is a deficient number, since it is larger than the sum of its proper divisors (1).

688583939 is an equidigital number, since it uses as much as digits as its factorization.

688583939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11197440, while the sum is 59.

The square root of 688583939 is about 26240.8829691381. The cubic root of 688583939 is about 883.0506805474.

The spelling of 688583939 in words is "six hundred eighty-eight million, five hundred eighty-three thousand, nine hundred thirty-nine".