684212393 has 2 divisors, whose sum is σ = 684212394. Its totient is φ = 684212392.

The previous prime is 684212359. The next prime is 684212407. The reversal of 684212393 is 393212486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368332864 + 315879529 = 19192^2 + 17773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684212393 is a prime.

It is not a weakly prime, because it can be changed into another prime (684212693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342106196 + 342106197.

It is an arithmetic number, because the mean of its divisors is an integer number (342106197).

Almost surely, 2^684212393 is an apocalyptic number.

It is an amenable number.

684212393 is a deficient number, since it is larger than the sum of its proper divisors (1).

684212393 is an equidigital number, since it uses as much as digits as its factorization.

684212393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 684212393 is about 26157.4538707421. The cubic root of 684212393 is about 881.1779992614.

The spelling of 684212393 in words is "six hundred eighty-four million, two hundred twelve thousand, three hundred ninety-three".