398027009 has 2 divisors, whose sum is σ = 398027010. Its totient is φ = 398027008.

The previous prime is 398026999. The next prime is 398027033. The reversal of 398027009 is 900720893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210337009 + 187690000 = 14503^2 + 13700^2 .

It is an emirp because it is prime and its reverse (900720893) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398027009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398027089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199013504 + 199013505.

It is an arithmetic number, because the mean of its divisors is an integer number (199013505).

Almost surely, 2^398027009 is an apocalyptic number.

It is an amenable number.

398027009 is a deficient number, since it is larger than the sum of its proper divisors (1).

398027009 is an equidigital number, since it uses as much as digits as its factorization.

398027009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 398027009 is about 19950.6142511954. The cubic root of 398027009 is about 735.5928756418.

Subtracting from 398027009 its product of nonzero digits (27216), we obtain a palindrome (397999793).

The spelling of 398027009 in words is "three hundred ninety-eight million, twenty-seven thousand, nine".