406396492409 has 2 divisors, whose sum is σ = 406396492410. Its totient is φ = 406396492408.

The previous prime is 406396492343. The next prime is 406396492427. The reversal of 406396492409 is 904294693604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 364954933225 + 41441559184 = 604115^2 + 203572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406396492409 is a prime.

It is not a weakly prime, because it can be changed into another prime (406396495409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203198246204 + 203198246205.

It is an arithmetic number, because the mean of its divisors is an integer number (203198246205).

Almost surely, 2^406396492409 is an apocalyptic number.

It is an amenable number.

406396492409 is a deficient number, since it is larger than the sum of its proper divisors (1).

406396492409 is an equidigital number, since it uses as much as digits as its factorization.

406396492409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 56.

The spelling of 406396492409 in words is "four hundred six billion, three hundred ninety-six million, four hundred ninety-two thousand, four hundred nine".