197853389 has 2 divisors, whose sum is σ = 197853390. Its totient is φ = 197853388.

The previous prime is 197853347. The next prime is 197853391. The reversal of 197853389 is 983358791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194128489 + 3724900 = 13933^2 + 1930^2 .

It is an emirp because it is prime and its reverse (983358791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197853389 is a prime.

Together with 197853391, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197853389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197853329) 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, 98926694 + 98926695.

It is an arithmetic number, because the mean of its divisors is an integer number (98926695).

Almost surely, 2^197853389 is an apocalyptic number.

It is an amenable number.

197853389 is a deficient number, since it is larger than the sum of its proper divisors (1).

197853389 is an equidigital number, since it uses as much as digits as its factorization.

197853389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The square root of 197853389 is about 14066.0367197018. The cubic root of 197853389 is about 582.7037744204.

The spelling of 197853389 in words is "one hundred ninety-seven million, eight hundred fifty-three thousand, three hundred eighty-nine".