401998217 has 2 divisors, whose sum is σ = 401998218. Its totient is φ = 401998216.

The previous prime is 401998199. The next prime is 401998249. The reversal of 401998217 is 712899104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400840441 + 1157776 = 20021^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 401998217 - 2⁸ = 401997961 is a prime.

It is not a weakly prime, because it can be changed into another prime (401998417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200999108 + 200999109.

It is an arithmetic number, because the mean of its divisors is an integer number (200999109).

Almost surely, 2^401998217 is an apocalyptic number.

It is an amenable number.

401998217 is a deficient number, since it is larger than the sum of its proper divisors (1).

401998217 is an equidigital number, since it uses as much as digits as its factorization.

401998217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 401998217 is about 20049.8931917355. The cubic root of 401998217 is about 738.0311780709.

The spelling of 401998217 in words is "four hundred one million, nine hundred ninety-eight thousand, two hundred seventeen".