406564421 has 2 divisors, whose sum is σ = 406564422. Its totient is φ = 406564420.

The previous prime is 406564393. The next prime is 406564439. The reversal of 406564421 is 124465604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399600100 + 6964321 = 19990^2 + 2639^2 .

It is a cyclic number.

It is not a de Polignac number, because 406564421 - 2¹⁰ = 406563397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406564471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203282210 + 203282211.

It is an arithmetic number, because the mean of its divisors is an integer number (203282211).

Almost surely, 2^406564421 is an apocalyptic number.

It is an amenable number.

406564421 is a deficient number, since it is larger than the sum of its proper divisors (1).

406564421 is an equidigital number, since it uses as much as digits as its factorization.

406564421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 406564421 is about 20163.4426872000. The cubic root of 406564421 is about 740.8150387988.

It can be divided in two parts, 4065 and 64421, that added together give a palindrome (68486).

The spelling of 406564421 in words is "four hundred six million, five hundred sixty-four thousand, four hundred twenty-one".