190805945 has 16 divisors (see below), whose sum is σ = 251190720. Its totient is φ = 137985600.

The previous prime is 190805911. The next prime is 190805959. The reversal of 190805945 is 549508091.

It is a happy number.

It is not a de Polignac number, because 190805945 - 2¹⁴ = 190789561 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155 + ... + 19535.

It is an arithmetic number, because the mean of its divisors is an integer number (15699420).

Almost surely, 2^190805945 is an apocalyptic number.

It is an amenable number.

190805945 is a deficient number, since it is larger than the sum of its proper divisors (60384775).

190805945 is a wasteful number, since it uses less digits than its factorization.

190805945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19576.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 190805945 is about 13813.2525134380. The cubic root of 190805945 is about 575.7014200097.

The spelling of 190805945 in words is "one hundred ninety million, eight hundred five thousand, nine hundred forty-five".