199559805 has 32 divisors (see below), whose sum is σ = 326954880. Its totient is φ = 103910400.

The previous prime is 199559783. The next prime is 199559807. The reversal of 199559805 is 508955991.

It is a happy number.

199559805 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 199559805 - 2⁷ = 199559677 is a prime.

It is a super-3 number, since 3×199559805³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199559807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109905 + ... + 111705.

It is an arithmetic number, because the mean of its divisors is an integer number (10217340).

Almost surely, 2^199559805 is an apocalyptic number.

199559805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199559805 is a deficient number, since it is larger than the sum of its proper divisors (127395075).

199559805 is a wasteful number, since it uses less digits than its factorization.

199559805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981.

The product of its (nonzero) digits is 729000, while the sum is 51.

The square root of 199559805 is about 14126.5638072392. The cubic root of 199559805 is about 584.3741864879.

The spelling of 199559805 in words is "one hundred ninety-nine million, five hundred fifty-nine thousand, eight hundred five".