405668213 has 2 divisors, whose sum is σ = 405668214. Its totient is φ = 405668212.

The previous prime is 405668203. The next prime is 405668267. The reversal of 405668213 is 312866504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259306609 + 146361604 = 16103^2 + 12098^2 .

It is a cyclic number.

It is not a de Polignac number, because 405668213 - 2¹⁰ = 405667189 is a prime.

It is a super-2 number, since 2×405668213² = 329133398077226738, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405668203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202834106 + 202834107.

It is an arithmetic number, because the mean of its divisors is an integer number (202834107).

Almost surely, 2^405668213 is an apocalyptic number.

It is an amenable number.

405668213 is a deficient number, since it is larger than the sum of its proper divisors (1).

405668213 is an equidigital number, since it uses as much as digits as its factorization.

405668213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 405668213 is about 20141.2068407035. The cubic root of 405668213 is about 740.2703011815.

The spelling of 405668213 in words is "four hundred five million, six hundred sixty-eight thousand, two hundred thirteen".