190505945 has 16 divisors (see below), whose sum is σ = 261854208. Its totient is φ = 130338240.

The previous prime is 190505923. The next prime is 190505947. The reversal of 190505945 is 549505091.

It is not a de Polignac number, because 190505945 - 2²² = 186311641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 190505899 and 190505908.

It is not an unprimeable number, because it can be changed into a prime (190505947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10232 + ... + 22038.

It is an arithmetic number, because the mean of its divisors is an integer number (16365888).

Almost surely, 2^190505945 is an apocalyptic number.

It is an amenable number.

190505945 is a deficient number, since it is larger than the sum of its proper divisors (71348263).

190505945 is a wasteful number, since it uses less digits than its factorization.

190505945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12280.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 190505945 is about 13802.3891047891. The cubic root of 190505945 is about 575.3995408388.

The spelling of 190505945 in words is "one hundred ninety million, five hundred five thousand, nine hundred forty-five".