199890243 has 48 divisors (see below), whose sum is σ = 350700480. Its totient is φ = 107267328.

The previous prime is 199890239. The next prime is 199890277. The reversal of 199890243 is 342098991.

199890243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199890243 - 2² = 199890239 is a prime.

It is a super-2 number, since 2×199890243² = 79912218493198098, which contains 22 as substring.

199890243 is a modest number, since divided by 90243 gives 1998 as remainder.

It is not an unprimeable number, because it can be changed into a prime (199890283) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66121 + ... + 69077.

It is an arithmetic number, because the mean of its divisors is an integer number (7306260).

Almost surely, 2^199890243 is an apocalyptic number.

199890243 is a deficient number, since it is larger than the sum of its proper divisors (150810237).

199890243 is a wasteful number, since it uses less digits than its factorization.

199890243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036 (or 3033 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 199890243 is about 14138.2545952462. The cubic root of 199890243 is about 584.6965509292.

The spelling of 199890243 in words is "one hundred ninety-nine million, eight hundred ninety thousand, two hundred forty-three".