189998603 has 4 divisors (see below), whose sum is σ = 190230288. Its totient is φ = 189766920.

The previous prime is 189998569. The next prime is 189998609. The reversal of 189998603 is 306899981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189998603 - 2¹⁰ = 189997579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189998609) 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 in 3 ways as a sum of consecutive naturals, for example, 114608 + ... + 116253.

It is an arithmetic number, because the mean of its divisors is an integer number (47557572).

Almost surely, 2^189998603 is an apocalyptic number.

189998603 is a deficient number, since it is larger than the sum of its proper divisors (231685).

189998603 is an equidigital number, since it uses as much as digits as its factorization.

189998603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231684.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 189998603 is about 13783.9980774810. The cubic root of 189998603 is about 574.8882989070. Note that the first 3 decimals are identical.

Adding to 189998603 its sum of digits (53), we get a square (189998656 = 13784²).

The spelling of 189998603 in words is "one hundred eighty-nine million, nine hundred ninety-eight thousand, six hundred three".