406685717 has 2 divisors, whose sum is σ = 406685718. Its totient is φ = 406685716.

The previous prime is 406685711. The next prime is 406685737. The reversal of 406685717 is 717586604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342028036 + 64657681 = 18494^2 + 8041^2 .

It is a cyclic number.

It is not a de Polignac number, because 406685717 - 2¹² = 406681621 is a prime.

It is a super-3 number, since 3×406685717³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406685711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203342858 + 203342859.

It is an arithmetic number, because the mean of its divisors is an integer number (203342859).

Almost surely, 2^406685717 is an apocalyptic number.

It is an amenable number.

406685717 is a deficient number, since it is larger than the sum of its proper divisors (1).

406685717 is an equidigital number, since it uses as much as digits as its factorization.

406685717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 406685717 is about 20166.4502825857. The cubic root of 406685717 is about 740.8887040136. Note that the first 3 decimals are identical.

The spelling of 406685717 in words is "four hundred six million, six hundred eighty-five thousand, seven hundred seventeen".