1678879 has 2 divisors, whose sum is σ = 1678880. Its totient is φ = 1678878.

The previous prime is 1678877. The next prime is 1678883. The reversal of 1678879 is 9788761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1678879 - 2¹ = 1678877 is a prime.

Together with 1678877, it forms a pair of twin primes.

1678879 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678871) 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, 839439 + 839440.

It is an arithmetic number, because the mean of its divisors is an integer number (839440).

2^1678879 is an apocalyptic number.

1678879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678879 is an equidigital number, since it uses as much as digits as its factorization.

1678879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 1678879 is about 1295.7156323824. The cubic root of 1678879 is about 118.8519921542.

The spelling of 1678879 in words is "one million, six hundred seventy-eight thousand, eight hundred seventy-nine".