189459905 has 4 divisors (see below), whose sum is σ = 227351892. Its totient is φ = 151567920.

The previous prime is 189459889. The next prime is 189459923. The reversal of 189459905 is 509954981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509954981 = 503 ⋅1013827.

It can be written as a sum of positive squares in 2 ways, for example, as 44209201 + 145250704 = 6649^2 + 12052^2 .

It is not a de Polignac number, because 189459905 - 2⁴ = 189459889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18945986 + ... + 18945995.

It is an arithmetic number, because the mean of its divisors is an integer number (56837973).

Almost surely, 2^189459905 is an apocalyptic number.

It is an amenable number.

189459905 is a deficient number, since it is larger than the sum of its proper divisors (37891987).

189459905 is an equidigital number, since it uses as much as digits as its factorization.

189459905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37891986.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 189459905 is about 13764.4435049151. The cubic root of 189459905 is about 574.3444627590.

The spelling of 189459905 in words is "one hundred eighty-nine million, four hundred fifty-nine thousand, nine hundred five".