405420409 has 2 divisors, whose sum is σ = 405420410. Its totient is φ = 405420408.

The previous prime is 405420397. The next prime is 405420413. The reversal of 405420409 is 904024504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275460409 + 129960000 = 16597^2 + 11400^2 .

It is a cyclic number.

It is not a de Polignac number, because 405420409 - 2¹⁵ = 405387641 is a prime.

It is not a weakly prime, because it can be changed into another prime (405420439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202710204 + 202710205.

It is an arithmetic number, because the mean of its divisors is an integer number (202710205).

Almost surely, 2^405420409 is an apocalyptic number.

It is an amenable number.

405420409 is a deficient number, since it is larger than the sum of its proper divisors (1).

405420409 is an equidigital number, since it uses as much as digits as its factorization.

405420409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 405420409 is about 20135.0542338480. The cubic root of 405420409 is about 740.1195381519.

The spelling of 405420409 in words is "four hundred five million, four hundred twenty thousand, four hundred nine".