406512217 has 4 divisors (see below), whose sum is σ = 411079860. Its totient is φ = 401944576.

The previous prime is 406512203. The next prime is 406512221. The reversal of 406512217 is 712215604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287505936 + 119006281 = 16956^2 + 10909^2 .

It is a cyclic number.

It is not a de Polignac number, because 406512217 - 2¹⁹ = 405987929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406512317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2283688 + ... + 2283865.

It is an arithmetic number, because the mean of its divisors is an integer number (102769965).

Almost surely, 2^406512217 is an apocalyptic number.

It is an amenable number.

406512217 is a deficient number, since it is larger than the sum of its proper divisors (4567643).

406512217 is an equidigital number, since it uses as much as digits as its factorization.

406512217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567642.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 406512217 is about 20162.1481246419. The cubic root of 406512217 is about 740.7833298726.

The spelling of 406512217 in words is "four hundred six million, five hundred twelve thousand, two hundred seventeen".