406443217 has 2 divisors, whose sum is σ = 406443218. Its totient is φ = 406443216.

The previous prime is 406443211. The next prime is 406443221. The reversal of 406443217 is 712344604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 266636241 + 139806976 = 16329^2 + 11824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406443217 is a prime.

It is not a weakly prime, because it can be changed into another prime (406443211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203221608 + 203221609.

It is an arithmetic number, because the mean of its divisors is an integer number (203221609).

Almost surely, 2^406443217 is an apocalyptic number.

It is an amenable number.

406443217 is a deficient number, since it is larger than the sum of its proper divisors (1).

406443217 is an equidigital number, since it uses as much as digits as its factorization.

406443217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 406443217 is about 20160.4369248288. The cubic root of 406443217 is about 740.7414148207.

The spelling of 406443217 in words is "four hundred six million, four hundred forty-three thousand, two hundred seventeen".