189643973 has 2 divisors, whose sum is σ = 189643974. Its totient is φ = 189643972.

The previous prime is 189643967. The next prime is 189644011. The reversal of 189643973 is 379346981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95902849 + 93741124 = 9793^2 + 9682^2 .

It is a cyclic number.

It is not a de Polignac number, because 189643973 - 2¹⁰ = 189642949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189643913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94821986 + 94821987.

It is an arithmetic number, because the mean of its divisors is an integer number (94821987).

Almost surely, 2^189643973 is an apocalyptic number.

It is an amenable number.

189643973 is a deficient number, since it is larger than the sum of its proper divisors (1).

189643973 is an equidigital number, since it uses as much as digits as its factorization.

189643973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 189643973 is about 13771.1282399083. The cubic root of 189643973 is about 574.5304022210.

The spelling of 189643973 in words is "one hundred eighty-nine million, six hundred forty-three thousand, nine hundred seventy-three".