199457 has 2 divisors, whose sum is σ = 199458. Its totient is φ = 199456.

The previous prime is 199453. The next prime is 199483. The reversal of 199457 is 754991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141376 + 58081 = 376^2 + 241^2 .

It is an emirp because it is prime and its reverse (754991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199457 - 2² = 199453 is a prime.

It is not a weakly prime, because it can be changed into another prime (199453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99728 + 99729.

It is an arithmetic number, because the mean of its divisors is an integer number (99729).

2¹⁹⁹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

199457 is a deficient number, since it is larger than the sum of its proper divisors (1).

199457 is an equidigital number, since it uses as much as digits as its factorization.

199457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 35.

The square root of 199457 is about 446.6060904197. The cubic root of 199457 is about 58.4273820739.

It can be divided in two parts, 199 and 457, that added together give a palindrome (656).

The spelling of 199457 in words is "one hundred ninety-nine thousand, four hundred fifty-seven".