398308907 has 2 divisors, whose sum is σ = 398308908. Its totient is φ = 398308906.

The previous prime is 398308877. The next prime is 398308921. The reversal of 398308907 is 709803893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398308907 - 2¹⁶ = 398243371 is a prime.

It is not a weakly prime, because it can be changed into another prime (398308007) 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, 199154453 + 199154454.

It is an arithmetic number, because the mean of its divisors is an integer number (199154454).

Almost surely, 2^398308907 is an apocalyptic number.

398308907 is a deficient number, since it is larger than the sum of its proper divisors (1).

398308907 is an equidigital number, since it uses as much as digits as its factorization.

398308907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 398308907 is about 19957.6778959878. The cubic root of 398308907 is about 735.7664930271.

The spelling of 398308907 in words is "three hundred ninety-eight million, three hundred eight thousand, nine hundred seven".