398193449 has 2 divisors, whose sum is σ = 398193450. Its totient is φ = 398193448.

The previous prime is 398193391. The next prime is 398193451. The reversal of 398193449 is 944391893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370177600 + 28015849 = 19240^2 + 5293^2 .

It is an emirp because it is prime and its reverse (944391893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398193449 - 2¹² = 398189353 is a prime.

Together with 398193451, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 398193397 and 398193406.

It is not a weakly prime, because it can be changed into another prime (398193479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199096724 + 199096725.

It is an arithmetic number, because the mean of its divisors is an integer number (199096725).

Almost surely, 2^398193449 is an apocalyptic number.

It is an amenable number.

398193449 is a deficient number, since it is larger than the sum of its proper divisors (1).

398193449 is an equidigital number, since it uses as much as digits as its factorization.

398193449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 398193449 is about 19954.7851153552. The cubic root of 398193449 is about 735.6953938243.

The spelling of 398193449 in words is "three hundred ninety-eight million, one hundred ninety-three thousand, four hundred forty-nine".