189974573 has 4 divisors (see below), whose sum is σ = 190002300. Its totient is φ = 189946848.

The previous prime is 189974569. The next prime is 189974581. The reversal of 189974573 is 375479981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 375479981 = 857 ⋅438133.

It can be written as a sum of positive squares in 2 ways, for example, as 40475044 + 149499529 = 6362^2 + 12227^2 .

It is a cyclic number.

It is not a de Polignac number, because 189974573 - 2² = 189974569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189974593) 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, 4703 + ... + 20051.

It is an arithmetic number, because the mean of its divisors is an integer number (47500575).

Almost surely, 2^189974573 is an apocalyptic number.

It is an amenable number.

189974573 is a deficient number, since it is larger than the sum of its proper divisors (27727).

189974573 is a wasteful number, since it uses less digits than its factorization.

189974573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27726.

The product of its digits is 1905120, while the sum is 53.

The square root of 189974573 is about 13783.1263869994. The cubic root of 189974573 is about 574.8640616265.

The spelling of 189974573 in words is "one hundred eighty-nine million, nine hundred seventy-four thousand, five hundred seventy-three".