406512409 has 2 divisors, whose sum is σ = 406512410. Its totient is φ = 406512408.

The previous prime is 406512397. The next prime is 406512413. The reversal of 406512409 is 904215604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211993600 + 194518809 = 14560^2 + 13947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406512409 is a prime.

It is not a weakly prime, because it can be changed into another prime (406512439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203256204 + 203256205.

It is an arithmetic number, because the mean of its divisors is an integer number (203256205).

Almost surely, 2^406512409 is an apocalyptic number.

It is an amenable number.

406512409 is a deficient number, since it is larger than the sum of its proper divisors (1).

406512409 is an equidigital number, since it uses as much as digits as its factorization.

406512409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 406512409 is about 20162.1528860387. The cubic root of 406512409 is about 740.7834464992.

The spelling of 406512409 in words is "four hundred six million, five hundred twelve thousand, four hundred nine".