1285679 has 2 divisors, whose sum is σ = 1285680. Its totient is φ = 1285678.

The previous prime is 1285649. The next prime is 1285699. The reversal of 1285679 is 9765821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285619) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642839 + 642840.

It is an arithmetic number, because the mean of its divisors is an integer number (642840).

2^1285679 is an apocalyptic number.

1285679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285679 is an equidigital number, since it uses as much as digits as its factorization.

1285679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 1285679 is about 1133.8778593835. The cubic root of 1285679 is about 108.7370425395.

The spelling of 1285679 in words is "one million, two hundred eighty-five thousand, six hundred seventy-nine".