197923879 has 2 divisors, whose sum is σ = 197923880. Its totient is φ = 197923878.

The previous prime is 197923853. The next prime is 197923897. The reversal of 197923879 is 978329791.

Together with next prime (197923897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (978329791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197923879 - 2⁷ = 197923751 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 (197923849) 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, 98961939 + 98961940.

It is an arithmetic number, because the mean of its divisors is an integer number (98961940).

Almost surely, 2^197923879 is an apocalyptic number.

197923879 is a deficient number, since it is larger than the sum of its proper divisors (1).

197923879 is an equidigital number, since it uses as much as digits as its factorization.

197923879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 55.

The square root of 197923879 is about 14068.5421774966. The cubic root of 197923879 is about 582.7729669208.

The spelling of 197923879 in words is "one hundred ninety-seven million, nine hundred twenty-three thousand, eight hundred seventy-nine".