199896813 has 6 divisors (see below), whose sum is σ = 288739854. Its totient is φ = 133264536.

The previous prime is 199896803. The next prime is 199896821. The reversal of 199896813 is 318698991.

It can be written as a sum of positive squares in only one way, i.e., 167883849 + 32012964 = 12957^2 + 5658^2 .

It is not a de Polignac number, because 199896813 - 2²¹ = 197799661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199896813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199896803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11105370 + ... + 11105387.

It is an arithmetic number, because the mean of its divisors is an integer number (48123309).

Almost surely, 2^199896813 is an apocalyptic number.

It is an amenable number.

199896813 is a deficient number, since it is larger than the sum of its proper divisors (88843041).

199896813 is a wasteful number, since it uses less digits than its factorization.

199896813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22210763 (or 22210760 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 199896813 is about 14138.4869416780. The cubic root of 199896813 is about 584.7029568017.

The spelling of 199896813 in words is "one hundred ninety-nine million, eight hundred ninety-six thousand, eight hundred thirteen".