398401039 has 2 divisors, whose sum is σ = 398401040. Its totient is φ = 398401038.

The previous prime is 398401037. The next prime is 398401051. The reversal of 398401039 is 930104893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398401039 - 2¹ = 398401037 is a prime.

Together with 398401037, 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 = 398400989 and 398401007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398401033) 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, 199200519 + 199200520.

It is an arithmetic number, because the mean of its divisors is an integer number (199200520).

Almost surely, 2^398401039 is an apocalyptic number.

398401039 is a deficient number, since it is larger than the sum of its proper divisors (1).

398401039 is an equidigital number, since it uses as much as digits as its factorization.

398401039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 398401039 is about 19959.9859468888. The cubic root of 398401039 is about 735.8232181897.

The spelling of 398401039 in words is "three hundred ninety-eight million, four hundred one thousand, thirty-nine".