199400843 has 4 divisors (see below), whose sum is σ = 199877160. Its totient is φ = 198924528.

The previous prime is 199400827. The next prime is 199400867. The reversal of 199400843 is 348004991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199400843 - 2⁴ = 199400827 is a prime.

It is a super-2 number, since 2×199400843² = 79521392378221298, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199400797 and 199400806.

It is not an unprimeable number, because it can be changed into a prime (199450843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237530 + ... + 238367.

It is an arithmetic number, because the mean of its divisors is an integer number (49969290).

Almost surely, 2^199400843 is an apocalyptic number.

199400843 is a deficient number, since it is larger than the sum of its proper divisors (476317).

199400843 is an equidigital number, since it uses as much as digits as its factorization.

199400843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476316.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 199400843 is about 14120.9363358100. The cubic root of 199400843 is about 584.2189816100.

The spelling of 199400843 in words is "one hundred ninety-nine million, four hundred thousand, eight hundred forty-three".