1684679 has 2 divisors, whose sum is σ = 1684680. Its totient is φ = 1684678.

The previous prime is 1684667. The next prime is 1684691. The reversal of 1684679 is 9764861.

It is a balanced prime because it is at equal distance from previous prime (1684667) and next prime (1684691).

It is a cyclic number.

It is not a de Polignac number, because 1684679 - 2¹² = 1680583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842339 + 842340.

It is an arithmetic number, because the mean of its divisors is an integer number (842340).

2^1684679 is an apocalyptic number.

1684679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684679 is an equidigital number, since it uses as much as digits as its factorization.

1684679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 1684679 is about 1297.9518481053. The cubic root of 1684679 is about 118.9887002900.

The spelling of 1684679 in words is "one million, six hundred eighty-four thousand, six hundred seventy-nine".