190809418 has 4 divisors (see below), whose sum is σ = 286214130. Its totient is φ = 95404708.

The previous prime is 190809391. The next prime is 190809439. The reversal of 190809418 is 814908091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 143928009 + 46881409 = 11997^2 + 6847^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47702353 + ... + 47702356.

Almost surely, 2^190809418 is an apocalyptic number.

190809418 is a deficient number, since it is larger than the sum of its proper divisors (95404712).

190809418 is an equidigital number, since it uses as much as digits as its factorization.

190809418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95404711.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 190809418 is about 13813.3782254740. The cubic root of 190809418 is about 575.7049129108.

The spelling of 190809418 in words is "one hundred ninety million, eight hundred nine thousand, four hundred eighteen".