1678423 has 2 divisors, whose sum is σ = 1678424. Its totient is φ = 1678422.

The previous prime is 1678421. The next prime is 1678429. The reversal of 1678423 is 3248761.

It is a weak prime.

It is an emirp because it is prime and its reverse (3248761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1678423 - 2¹ = 1678421 is a prime.

Together with 1678421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839211 + 839212.

It is an arithmetic number, because the mean of its divisors is an integer number (839212).

2^1678423 is an apocalyptic number.

1678423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678423 is an equidigital number, since it uses as much as digits as its factorization.

1678423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 1678423 is about 1295.5396558963. The cubic root of 1678423 is about 118.8412307243.

It can be divided in two parts, 16784 and 23, that added together give a 5-th power (16807 = 7⁵).

The spelling of 1678423 in words is "one million, six hundred seventy-eight thousand, four hundred twenty-three".