406247 has 2 divisors, whose sum is σ = 406248. Its totient is φ = 406246.

The previous prime is 406207. The next prime is 406253. The reversal of 406247 is 742604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406247 - 2⁶ = 406183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203123 + 203124.

It is an arithmetic number, because the mean of its divisors is an integer number (203124).

2⁴⁰⁶²⁴⁷ is an apocalyptic number.

406247 is a deficient number, since it is larger than the sum of its proper divisors (1).

406247 is an equidigital number, since it uses as much as digits as its factorization.

406247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 406247 is about 637.3750858011. The cubic root of 406247 is about 74.0622194023.

The spelling of 406247 in words is "four hundred six thousand, two hundred forty-seven".