405406489 has 2 divisors, whose sum is σ = 405406490. Its totient is φ = 405406488.

The previous prime is 405406471. The next prime is 405406511. The reversal of 405406489 is 984604504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388760089 + 16646400 = 19717^2 + 4080^2 .

It is a cyclic number.

It is not a de Polignac number, because 405406489 - 2⁹ = 405405977 is a prime.

It is not a weakly prime, because it can be changed into another prime (405406459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202703244 + 202703245.

It is an arithmetic number, because the mean of its divisors is an integer number (202703245).

Almost surely, 2^405406489 is an apocalyptic number.

It is an amenable number.

405406489 is a deficient number, since it is larger than the sum of its proper divisors (1).

405406489 is an equidigital number, since it uses as much as digits as its factorization.

405406489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 405406489 is about 20134.7085650625. The cubic root of 405406489 is about 740.1110674536. Note that the first 3 decimals are identical.

The spelling of 405406489 in words is "four hundred five million, four hundred six thousand, four hundred eighty-nine".