398207387 has 2 divisors, whose sum is σ = 398207388. Its totient is φ = 398207386.

The previous prime is 398207333. The next prime is 398207389. The reversal of 398207387 is 783702893.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (783702893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398207387 - 2²² = 394013083 is a prime.

It is a super-2 number, since 2×398207387² = 317138246122735538, which contains 22 as substring.

Together with 398207389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398207389) 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, 199103693 + 199103694.

It is an arithmetic number, because the mean of its divisors is an integer number (199103694).

Almost surely, 2^398207387 is an apocalyptic number.

398207387 is a deficient number, since it is larger than the sum of its proper divisors (1).

398207387 is an equidigital number, since it uses as much as digits as its factorization.

398207387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 398207387 is about 19955.1343518404. The cubic root of 398207387 is about 735.7039775942.

The spelling of 398207387 in words is "three hundred ninety-eight million, two hundred seven thousand, three hundred eighty-seven".