199801835 has 4 divisors (see below), whose sum is σ = 239762208. Its totient is φ = 159841464.

The previous prime is 199801831. The next prime is 199801871. The reversal of 199801835 is 538108991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 538108991 = 7 ⋅76872713.

It is a cyclic number.

It is not a de Polignac number, because 199801835 - 2² = 199801831 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199801831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19980179 + ... + 19980188.

It is an arithmetic number, because the mean of its divisors is an integer number (59940552).

Almost surely, 2^199801835 is an apocalyptic number.

199801835 is a deficient number, since it is larger than the sum of its proper divisors (39960373).

199801835 is an equidigital number, since it uses as much as digits as its factorization.

199801835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39960372.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 199801835 is about 14135.1276966287. The cubic root of 199801835 is about 584.6103378244.

The spelling of 199801835 in words is "one hundred ninety-nine million, eight hundred one thousand, eight hundred thirty-five".