684076369 has 2 divisors, whose sum is σ = 684076370. Its totient is φ = 684076368.

The previous prime is 684076343. The next prime is 684076381. The reversal of 684076369 is 963670486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 636300625 + 47775744 = 25225^2 + 6912^2 .

It is a cyclic number.

It is not a de Polignac number, because 684076369 - 2¹⁵ = 684043601 is a prime.

It is a super-2 number, since 2×684076369² = 935920957248448322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (684076069) 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, 342038184 + 342038185.

It is an arithmetic number, because the mean of its divisors is an integer number (342038185).

Almost surely, 2^684076369 is an apocalyptic number.

It is an amenable number.

684076369 is a deficient number, since it is larger than the sum of its proper divisors (1).

684076369 is an equidigital number, since it uses as much as digits as its factorization.

684076369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 684076369 is about 26154.8536413416. The cubic root of 684076369 is about 881.1196015566.

The spelling of 684076369 in words is "six hundred eighty-four million, seventy-six thousand, three hundred sixty-nine".