206440417 has 2 divisors, whose sum is σ = 206440418. Its totient is φ = 206440416.

The previous prime is 206440373. The next prime is 206440457. The reversal of 206440417 is 714044602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159668496 + 46771921 = 12636^2 + 6839^2 .

It is a cyclic number.

It is not a de Polignac number, because 206440417 - 2¹¹ = 206438369 is a prime.

It is a super-2 number, since 2×206440417² = 85235291542267778, which contains 22 as substring.

It is a Chen prime.

It is equal to p_11415646 and since 206440417 and 11415646 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (206440457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103220208 + 103220209.

It is an arithmetic number, because the mean of its divisors is an integer number (103220209).

Almost surely, 2^206440417 is an apocalyptic number.

It is an amenable number.

206440417 is a deficient number, since it is larger than the sum of its proper divisors (1).

206440417 is an equidigital number, since it uses as much as digits as its factorization.

206440417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 206440417 is about 14368.0345559161. The cubic root of 206440417 is about 591.0146449609.

The spelling of 206440417 in words is "two hundred six million, four hundred forty thousand, four hundred seventeen".