1816979 has 2 divisors, whose sum is σ = 1816980. Its totient is φ = 1816978.

The previous prime is 1816963. The next prime is 1816987. The reversal of 1816979 is 9796181.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1816979 - 2⁴ = 1816963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1816949) 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, 908489 + 908490.

It is an arithmetic number, because the mean of its divisors is an integer number (908490).

2^1816979 is an apocalyptic number.

1816979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816979 is an equidigital number, since it uses as much as digits as its factorization.

1816979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 1816979 is about 1347.9536342174. The cubic root of 1816979 is about 122.0253239556.

The spelling of 1816979 in words is "one million, eight hundred sixteen thousand, nine hundred seventy-nine".