1684427 has 2 divisors, whose sum is σ = 1684428. Its totient is φ = 1684426.

The previous prime is 1684409. The next prime is 1684477. The reversal of 1684427 is 7244861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1684427 - 2⁸ = 1684171 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1684393 and 1684402.

It is not a weakly prime, because it can be changed into another prime (1684477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842213 + 842214.

It is an arithmetic number, because the mean of its divisors is an integer number (842214).

2^1684427 is an apocalyptic number.

1684427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684427 is an equidigital number, since it uses as much as digits as its factorization.

1684427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 1684427 is about 1297.8547684545. The cubic root of 1684427 is about 118.9827670830.

The spelling of 1684427 in words is "one million, six hundred eighty-four thousand, four hundred twenty-seven".