189999983 has 2 divisors, whose sum is σ = 189999984. Its totient is φ = 189999982.

The previous prime is 189999949. The next prime is 189999989. The reversal of 189999983 is 389999981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189999983 - 2¹⁶ = 189934447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94999991 + 94999992.

It is an arithmetic number, because the mean of its divisors is an integer number (94999992).

Almost surely, 2^189999983 is an apocalyptic number.

189999983 is a deficient number, since it is larger than the sum of its proper divisors (1).

189999983 is an equidigital number, since it uses as much as digits as its factorization.

189999983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11337408, while the sum is 65.

The square root of 189999983 is about 13784.0481354354. The cubic root of 189999983 is about 574.8896907486.

It can be divided in two parts, 18999 and 9983, that added together give a palindrome (28982).

The spelling of 189999983 in words is "one hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-three".