19879697 has 2 divisors, whose sum is σ = 19879698. Its totient is φ = 19879696.

The previous prime is 19879679. The next prime is 19879733. The reversal of 19879697 is 79697891.

Together with previous prime (19879679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 201601 = 4436^2 + 449^2 .

It is a cyclic number.

It is not a de Polignac number, because 19879697 - 2⁶ = 19879633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19879627) 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, 9939848 + 9939849.

It is an arithmetic number, because the mean of its divisors is an integer number (9939849).

Almost surely, 2^19879697 is an apocalyptic number.

It is an amenable number.

19879697 is a deficient number, since it is larger than the sum of its proper divisors (1).

19879697 is an equidigital number, since it uses as much as digits as its factorization.

19879697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 56.

The square root of 19879697 is about 4458.6653832733. The cubic root of 19879697 is about 270.8964124368.

The spelling of 19879697 in words is "nineteen million, eight hundred seventy-nine thousand, six hundred ninety-seven".