684973 has 2 divisors, whose sum is σ = 684974. Its totient is φ = 684972.

The previous prime is 684961. The next prime is 684977. The reversal of 684973 is 379486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580644 + 104329 = 762^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 684973 - 2¹⁷ = 553901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342486 + 342487.

It is an arithmetic number, because the mean of its divisors is an integer number (342487).

2⁶⁸⁴⁹⁷³ is an apocalyptic number.

It is an amenable number.

684973 is a deficient number, since it is larger than the sum of its proper divisors (1).

684973 is an equidigital number, since it uses as much as digits as its factorization.

684973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 684973 is about 827.6309564051. The cubic root of 684973 is about 88.1504399835.

It can be divided in two parts, 68 and 4973, that added together give a square (5041 = 71²).

The spelling of 684973 in words is "six hundred eighty-four thousand, nine hundred seventy-three".