398407663 has 2 divisors, whose sum is σ = 398407664. Its totient is φ = 398407662.

The previous prime is 398407657. The next prime is 398407687. The reversal of 398407663 is 366704893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398407663 - 2²⁵ = 364853231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398407613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199203831 + 199203832.

It is an arithmetic number, because the mean of its divisors is an integer number (199203832).

Almost surely, 2^398407663 is an apocalyptic number.

398407663 is a deficient number, since it is larger than the sum of its proper divisors (1).

398407663 is an equidigital number, since it uses as much as digits as its factorization.

398407663 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 46.

The square root of 398407663 is about 19960.1518781797. The cubic root of 398407663 is about 735.8272962129.

The spelling of 398407663 in words is "three hundred ninety-eight million, four hundred seven thousand, six hundred sixty-three".