683721893 has 4 divisors (see below), whose sum is σ = 707298540. Its totient is φ = 660145248.

The previous prime is 683721847. The next prime is 683721917. The reversal of 683721893 is 398127386.

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

It can be written as a sum of positive squares in 2 ways, for example, as 148401124 + 535320769 = 12182^2 + 23137^2 .

It is a cyclic number.

It is not a de Polignac number, because 683721893 - 2⁸ = 683721637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683721193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11788280 + ... + 11788337.

It is an arithmetic number, because the mean of its divisors is an integer number (176824635).

Almost surely, 2^683721893 is an apocalyptic number.

It is an amenable number.

683721893 is a deficient number, since it is larger than the sum of its proper divisors (23576647).

683721893 is a wasteful number, since it uses less digits than its factorization.

683721893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23576646.

The product of its digits is 435456, while the sum is 47.

The square root of 683721893 is about 26148.0762772331. The cubic root of 683721893 is about 880.9673818482.

The spelling of 683721893 in words is "six hundred eighty-three million, seven hundred twenty-one thousand, eight hundred ninety-three".