199404893 has 2 divisors, whose sum is σ = 199404894. Its totient is φ = 199404892.

The previous prime is 199404839. The next prime is 199404923. The reversal of 199404893 is 398404991.

Together with previous prime (199404839) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175218169 + 24186724 = 13237^2 + 4918^2 .

It is a cyclic number.

It is not a de Polignac number, because 199404893 - 2⁸ = 199404637 is a prime.

It is a super-2 number, since 2×199404893² = 79524622704682898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199401893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99702446 + 99702447.

It is an arithmetic number, because the mean of its divisors is an integer number (99702447).

Almost surely, 2^199404893 is an apocalyptic number.

It is an amenable number.

199404893 is a deficient number, since it is larger than the sum of its proper divisors (1).

199404893 is an equidigital number, since it uses as much as digits as its factorization.

199404893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 199404893 is about 14121.0797391701. The cubic root of 199404893 is about 584.2229369107. Note that the first 3 decimals are identical.

The spelling of 199404893 in words is "one hundred ninety-nine million, four hundred four thousand, eight hundred ninety-three".