196388989 has 2 divisors, whose sum is σ = 196388990. Its totient is φ = 196388988.

The previous prime is 196388971. The next prime is 196389031. The reversal of 196388989 is 989883691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157076089 + 39312900 = 12533^2 + 6270^2 .

It is a cyclic number.

It is not a de Polignac number, because 196388989 - 2⁷ = 196388861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196388089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98194494 + 98194495.

It is an arithmetic number, because the mean of its divisors is an integer number (98194495).

Almost surely, 2^196388989 is an apocalyptic number.

It is an amenable number.

196388989 is a deficient number, since it is larger than the sum of its proper divisors (1).

196388989 is an equidigital number, since it uses as much as digits as its factorization.

196388989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 61.

The square root of 196388989 is about 14013.8855782399. The cubic root of 196388989 is about 581.2625972681.

The spelling of 196388989 in words is "one hundred ninety-six million, three hundred eighty-eight thousand, nine hundred eighty-nine".