398239087 has 2 divisors, whose sum is σ = 398239088. Its totient is φ = 398239086.

The previous prime is 398239081. The next prime is 398239091. The reversal of 398239087 is 780932893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398239087 - 2⁷ = 398238959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398239087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398239081) 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, 199119543 + 199119544.

It is an arithmetic number, because the mean of its divisors is an integer number (199119544).

Almost surely, 2^398239087 is an apocalyptic number.

398239087 is a deficient number, since it is larger than the sum of its proper divisors (1).

398239087 is an equidigital number, since it uses as much as digits as its factorization.

398239087 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 398239087 is about 19955.9286178318. The cubic root of 398239087 is about 735.7234994129.

The spelling of 398239087 in words is "three hundred ninety-eight million, two hundred thirty-nine thousand, eighty-seven".