684390143 has 2 divisors, whose sum is σ = 684390144. Its totient is φ = 684390142.

The previous prime is 684390137. The next prime is 684390149. The reversal of 684390143 is 341093486.

It is a balanced prime because it is at equal distance from previous prime (684390137) and next prime (684390149).

It is a cyclic number.

It is not a de Polignac number, because 684390143 - 2⁶ = 684390079 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 684390097 and 684390106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684390149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342195071 + 342195072.

It is an arithmetic number, because the mean of its divisors is an integer number (342195072).

Almost surely, 2^684390143 is an apocalyptic number.

684390143 is a deficient number, since it is larger than the sum of its proper divisors (1).

684390143 is an equidigital number, since it uses as much as digits as its factorization.

684390143 is an evil number, because the sum of its binary digits is even.

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

The square root of 684390143 is about 26160.8513431807. The cubic root of 684390143 is about 881.2542990720.

The spelling of 684390143 in words is "six hundred eighty-four million, three hundred ninety thousand, one hundred forty-three".