1656979 has 2 divisors, whose sum is σ = 1656980. Its totient is φ = 1656978.

The previous prime is 1656953. The next prime is 1656997. The reversal of 1656979 is 9796561.

Together with next prime (1656997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1656979 - 2⁵ = 1656947 is a prime.

1656979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1656079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828489 + 828490.

It is an arithmetic number, because the mean of its divisors is an integer number (828490).

2^1656979 is an apocalyptic number.

1656979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656979 is an equidigital number, since it uses as much as digits as its factorization.

1656979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 43.

The square root of 1656979 is about 1287.2369634220. The cubic root of 1656979 is about 118.3329436386.

The spelling of 1656979 in words is "one million, six hundred fifty-six thousand, nine hundred seventy-nine".