189984997 has 2 divisors, whose sum is σ = 189984998. Its totient is φ = 189984996.

The previous prime is 189984947. The next prime is 189985001. The reversal of 189984997 is 799489981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141348321 + 48636676 = 11889^2 + 6974^2 .

It is a cyclic number.

It is not a de Polignac number, because 189984997 - 2²⁷ = 55767269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189984917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94992498 + 94992499.

It is an arithmetic number, because the mean of its divisors is an integer number (94992499).

Almost surely, 2^189984997 is an apocalyptic number.

It is an amenable number.

189984997 is a deficient number, since it is larger than the sum of its proper divisors (1).

189984997 is an equidigital number, since it uses as much as digits as its factorization.

189984997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 64.

The square root of 189984997 is about 13783.5045253375. The cubic root of 189984997 is about 574.8745757939.

The spelling of 189984997 in words is "one hundred eighty-nine million, nine hundred eighty-four thousand, nine hundred ninety-seven".