398972027 has 2 divisors, whose sum is σ = 398972028. Its totient is φ = 398972026.

The previous prime is 398971973. The next prime is 398972039. The reversal of 398972027 is 720279893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398972027 - 2¹² = 398967931 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398972087) 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, 199486013 + 199486014.

It is an arithmetic number, because the mean of its divisors is an integer number (199486014).

Almost surely, 2^398972027 is an apocalyptic number.

398972027 is a deficient number, since it is larger than the sum of its proper divisors (1).

398972027 is an equidigital number, since it uses as much as digits as its factorization.

398972027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 398972027 is about 19974.2841423667. The cubic root of 398972027 is about 736.1745774388.

The spelling of 398972027 in words is "three hundred ninety-eight million, nine hundred seventy-two thousand, twenty-seven".