189935905 has 8 divisors (see below), whose sum is σ = 228413952. Its totient is φ = 151621488.

The previous prime is 189935899. The next prime is 189935953. The reversal of 189935905 is 509539981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189935905 - 2⁵ = 189935873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38337 + ... + 43006.

It is an arithmetic number, because the mean of its divisors is an integer number (28551744).

Almost surely, 2^189935905 is an apocalyptic number.

It is an amenable number.

189935905 is a deficient number, since it is larger than the sum of its proper divisors (38478047).

189935905 is an equidigital number, since it uses as much as digits as its factorization.

189935905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81815.

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 189935905 is about 13781.7235859670. The cubic root of 189935905 is about 574.8250557892.

The spelling of 189935905 in words is "one hundred eighty-nine million, nine hundred thirty-five thousand, nine hundred five".