1678394 has 12 divisors (see below), whose sum is σ = 2591694. Its totient is φ = 815184.

The previous prime is 1678381. The next prime is 1678399. The reversal of 1678394 is 4938761.

It can be written as a sum of positive squares in 3 ways, for example, as 1530169 + 148225 = 1237^2 + 385^2 .

It is not an unprimeable number, because it can be changed into a prime (1678399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2432 + ... + 3044.

2^1678394 is an apocalyptic number.

1678394 is a deficient number, since it is larger than the sum of its proper divisors (913300).

1678394 is an equidigital number, since it uses as much as digits as its factorization.

1678394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 652 counting only the distinct ones).

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

The square root of 1678394 is about 1295.5284636009. The cubic root of 1678394 is about 118.8405462692.

The spelling of 1678394 in words is "one million, six hundred seventy-eight thousand, three hundred ninety-four".