684868937 has 2 divisors, whose sum is σ = 684868938. Its totient is φ = 684868936.

The previous prime is 684868897. The next prime is 684869027. The reversal of 684868937 is 739868486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604963216 + 79905721 = 24596^2 + 8939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684868937 is a prime.

It is not a weakly prime, because it can be changed into another prime (684838937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342434468 + 342434469.

It is an arithmetic number, because the mean of its divisors is an integer number (342434469).

Almost surely, 2^684868937 is an apocalyptic number.

It is an amenable number.

684868937 is a deficient number, since it is larger than the sum of its proper divisors (1).

684868937 is an equidigital number, since it uses as much as digits as its factorization.

684868937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 59.

The square root of 684868937 is about 26170.0007069163. Note that the first 3 decimals coincide. The cubic root of 684868937 is about 881.4597573759.

The spelling of 684868937 in words is "six hundred eighty-four million, eight hundred sixty-eight thousand, nine hundred thirty-seven".