406203997 has 2 divisors, whose sum is σ = 406203998. Its totient is φ = 406203996.

The previous prime is 406203991. The next prime is 406204013. The reversal of 406203997 is 799302604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302551236 + 103652761 = 17394^2 + 10181^2 .

It is a cyclic number.

It is not a de Polignac number, because 406203997 - 2¹⁵ = 406171229 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406203991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203101998 + 203101999.

It is an arithmetic number, because the mean of its divisors is an integer number (203101999).

Almost surely, 2^406203997 is an apocalyptic number.

It is an amenable number.

406203997 is a deficient number, since it is larger than the sum of its proper divisors (1).

406203997 is an equidigital number, since it uses as much as digits as its factorization.

406203997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 406203997 is about 20154.5031444588. The cubic root of 406203997 is about 740.5960604144.

The spelling of 406203997 in words is "four hundred six million, two hundred three thousand, nine hundred ninety-seven".