699939857 has 2 divisors, whose sum is σ = 699939858. Its totient is φ = 699939856.

The previous prime is 699939817. The next prime is 699939869. The reversal of 699939857 is 758939996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386083201 + 313856656 = 19649^2 + 17716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699939857 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 699939793 and 699939802.

It is not a weakly prime, because it can be changed into another prime (699939817) 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, 349969928 + 349969929.

It is an arithmetic number, because the mean of its divisors is an integer number (349969929).

Almost surely, 2^699939857 is an apocalyptic number.

It is an amenable number.

699939857 is a deficient number, since it is larger than the sum of its proper divisors (1).

699939857 is an equidigital number, since it uses as much as digits as its factorization.

699939857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33067440, while the sum is 65.

The square root of 699939857 is about 26456.3764903662. The cubic root of 699939857 is about 887.8785718665.

The spelling of 699939857 in words is "six hundred ninety-nine million, nine hundred thirty-nine thousand, eight hundred fifty-seven".