197399999 has 2 divisors, whose sum is σ = 197400000. Its totient is φ = 197399998.

The previous prime is 197399989. The next prime is 197400011. The reversal of 197399999 is 999993791.

It is a weak prime.

It is an emirp because it is prime and its reverse (999993791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197399999 - 2¹⁶ = 197334463 is a prime.

It is a Chen prime.

197399999 is a modest number, since divided by 99999 gives 1973 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197399929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98699999 + 98700000.

It is an arithmetic number, because the mean of its divisors is an integer number (98700000).

Almost surely, 2^197399999 is an apocalyptic number.

197399999 is a deficient number, since it is larger than the sum of its proper divisors (1).

197399999 is an equidigital number, since it uses as much as digits as its factorization.

197399999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11160261, while the sum is 65.

The square root of 197399999 is about 14049.9109961594. The cubic root of 197399999 is about 582.2583366384.

The spelling of 197399999 in words is "one hundred ninety-seven million, three hundred ninety-nine thousand, nine hundred ninety-nine".