240400404217 has 2 divisors, whose sum is σ = 240400404218. Its totient is φ = 240400404216.

The previous prime is 240400404203. The next prime is 240400404239. The reversal of 240400404217 is 712404004042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220776877161 + 19623527056 = 469869^2 + 140084^2 .

It is a cyclic number.

It is not a de Polignac number, because 240400404217 - 2⁷ = 240400404089 is a prime.

It is not a weakly prime, because it can be changed into another prime (240400404287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120200202108 + 120200202109.

It is an arithmetic number, because the mean of its divisors is an integer number (120200202109).

Almost surely, 2^240400404217 is an apocalyptic number.

It is an amenable number.

240400404217 is a deficient number, since it is larger than the sum of its proper divisors (1).

240400404217 is an equidigital number, since it uses as much as digits as its factorization.

240400404217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 28.

Adding to 240400404217 its reverse (712404004042), we get a palindrome (952804408259).

The spelling of 240400404217 in words is "two hundred forty billion, four hundred million, four hundred four thousand, two hundred seventeen".