684683999 has 4 divisors (see below), whose sum is σ = 685098864. Its totient is φ = 684269136.

The previous prime is 684683917. The next prime is 684684023. The reversal of 684683999 is 999386486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684683999 - 2¹⁶ = 684618463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684683299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204947 + ... + 208260.

It is an arithmetic number, because the mean of its divisors is an integer number (171274716).

Almost surely, 2^684683999 is an apocalyptic number.

684683999 is a deficient number, since it is larger than the sum of its proper divisors (414865).

684683999 is a wasteful number, since it uses less digits than its factorization.

684683999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414864.

The product of its digits is 20155392, while the sum is 62.

The square root of 684683999 is about 26166.4670714256. The cubic root of 684683999 is about 881.3804088216.

The spelling of 684683999 in words is "six hundred eighty-four million, six hundred eighty-three thousand, nine hundred ninety-nine".