1678349 has 2 divisors, whose sum is σ = 1678350. Its totient is φ = 1678348.

The previous prime is 1678337. The next prime is 1678361. The reversal of 1678349 is 9438761.

It is a balanced prime because it is at equal distance from previous prime (1678337) and next prime (1678361).

It can be written as a sum of positive squares in only one way, i.e., 964324 + 714025 = 982^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678349 - 2⁸ = 1678093 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839174 + 839175.

It is an arithmetic number, because the mean of its divisors is an integer number (839175).

2^1678349 is an apocalyptic number.

It is an amenable number.

1678349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678349 is an equidigital number, since it uses as much as digits as its factorization.

1678349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 1678349 is about 1295.5110960544. The cubic root of 1678349 is about 118.8394841681.

The spelling of 1678349 in words is "one million, six hundred seventy-eight thousand, three hundred forty-nine".