199404805 has 8 divisors (see below), whose sum is σ = 241655544. Its totient is φ = 157944000.

The previous prime is 199404787. The next prime is 199404809. The reversal of 199404805 is 508404991.

199404805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77898276 + 121506529 = 8826^2 + 11023^2 .

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

It is not a de Polignac number, because 199404805 - 2⁵ = 199404773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199404809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196926 + ... + 197935.

It is an arithmetic number, because the mean of its divisors is an integer number (30206943).

Almost surely, 2^199404805 is an apocalyptic number.

It is an amenable number.

199404805 is a deficient number, since it is larger than the sum of its proper divisors (42250739).

199404805 is a wasteful number, since it uses less digits than its factorization.

199404805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394967.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 199404805 is about 14121.0766232607. The cubic root of 199404805 is about 584.2228509689. Note that the first 3 decimals are identical.

The spelling of 199404805 in words is "one hundred ninety-nine million, four hundred four thousand, eight hundred five".