199749805 has 8 divisors (see below), whose sum is σ = 239776992. Its totient is φ = 159748368.

The previous prime is 199749799. The next prime is 199749853. The reversal of 199749805 is 508947991.

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

It is a cyclic number.

It is not a de Polignac number, because 199749805 - 2¹⁷ = 199618733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22314 + ... + 29956.

It is an arithmetic number, because the mean of its divisors is an integer number (29972124).

Almost surely, 2^199749805 is an apocalyptic number.

It is an amenable number.

199749805 is a deficient number, since it is larger than the sum of its proper divisors (40027187).

199749805 is an equidigital number, since it uses as much as digits as its factorization.

199749805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12875.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 199749805 is about 14133.2871264968. The cubic root of 199749805 is about 584.5595876790.

The spelling of 199749805 in words is "one hundred ninety-nine million, seven hundred forty-nine thousand, eight hundred five".