398865647 has 2 divisors, whose sum is σ = 398865648. Its totient is φ = 398865646.

The previous prime is 398865637. The next prime is 398865653. The reversal of 398865647 is 746568893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398865647 - 2⁶ = 398865583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398865592 and 398865601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398865637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199432823 + 199432824.

It is an arithmetic number, because the mean of its divisors is an integer number (199432824).

Almost surely, 2^398865647 is an apocalyptic number.

398865647 is a deficient number, since it is larger than the sum of its proper divisors (1).

398865647 is an equidigital number, since it uses as much as digits as its factorization.

398865647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 56.

The square root of 398865647 is about 19971.6210408670. The cubic root of 398865647 is about 736.1091415956.

The spelling of 398865647 in words is "three hundred ninety-eight million, eight hundred sixty-five thousand, six hundred forty-seven".