398217398217 has 16 divisors (see below), whose sum is σ = 536271723840. Its totient is φ = 262821240000.

The previous prime is 398217398207. The next prime is 398217398233. The reversal of 398217398217 is 712893712893.

It is not a de Polignac number, because 398217398217 - 2¹⁴ = 398217381833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398217398207) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2933634 + ... + 3066372.

It is an arithmetic number, because the mean of its divisors is an integer number (33516982740).

Almost surely, 2^398217398217 is an apocalyptic number.

It is an amenable number.

398217398217 is a deficient number, since it is larger than the sum of its proper divisors (138054325623).

398217398217 is a wasteful number, since it uses less digits than its factorization.

398217398217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142744.

The product of its digits is 9144576, while the sum is 60.

The spelling of 398217398217 in words is "three hundred ninety-eight billion, two hundred seventeen million, three hundred ninety-eight thousand, two hundred seventeen".