398207663 has 12 divisors (see below), whose sum is σ = 463827240. Its totient is φ = 340874352.

The previous prime is 398207657. The next prime is 398207683. The reversal of 398207663 is 366702893.

It is not a de Polignac number, because 398207663 - 2²² = 394013359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398207683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35720 + ... + 45522.

It is an arithmetic number, because the mean of its divisors is an integer number (38652270).

Almost surely, 2^398207663 is an apocalyptic number.

398207663 is a deficient number, since it is larger than the sum of its proper divisors (65619577).

398207663 is an equidigital number, since it uses as much as digits as its factorization.

398207663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10646 (or 10639 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 398207663 is about 19955.1412673526. The cubic root of 398207663 is about 735.7041475678.

The spelling of 398207663 in words is "three hundred ninety-eight million, two hundred seven thousand, six hundred sixty-three".