398207389 has 2 divisors, whose sum is σ = 398207390. Its totient is φ = 398207388.

The previous prime is 398207387. The next prime is 398207399. The reversal of 398207389 is 983702893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341325625 + 56881764 = 18475^2 + 7542^2 .

It is a cyclic number.

It is not a de Polignac number, because 398207389 - 2¹ = 398207387 is a prime.

Together with 398207387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398207387) 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, 199103694 + 199103695.

It is an arithmetic number, because the mean of its divisors is an integer number (199103695).

Almost surely, 2^398207389 is an apocalyptic number.

It is an amenable number.

398207389 is a deficient number, since it is larger than the sum of its proper divisors (1).

398207389 is an equidigital number, since it uses as much as digits as its factorization.

398207389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 398207389 is about 19955.1344019528. The cubic root of 398207389 is about 735.7039788258.

The spelling of 398207389 in words is "three hundred ninety-eight million, two hundred seven thousand, three hundred eighty-nine".