406205549 has 2 divisors, whose sum is σ = 406205550. Its totient is φ = 406205548.

The previous prime is 406205543. The next prime is 406205567. The reversal of 406205549 is 945502604.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393744649 + 12460900 = 19843^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 406205549 - 2⁴ = 406205533 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 (406205543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203102774 + 203102775.

It is an arithmetic number, because the mean of its divisors is an integer number (203102775).

Almost surely, 2^406205549 is an apocalyptic number.

It is an amenable number.

406205549 is a deficient number, since it is larger than the sum of its proper divisors (1).

406205549 is an equidigital number, since it uses as much as digits as its factorization.

406205549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 406205549 is about 20154.5416469837. The cubic root of 406205549 is about 740.5970036216.

The spelling of 406205549 in words is "four hundred six million, two hundred five thousand, five hundred forty-nine".