817630393 has 2 divisors, whose sum is σ = 817630394. Its totient is φ = 817630392.

The previous prime is 817630367. The next prime is 817630399. The reversal of 817630393 is 393036718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500327424 + 317302969 = 22368^2 + 17813^2 .

It is a cyclic number.

It is not a de Polignac number, because 817630393 - 2⁹ = 817629881 is a prime.

It is not a weakly prime, because it can be changed into another prime (817630399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408815196 + 408815197.

It is an arithmetic number, because the mean of its divisors is an integer number (408815197).

Almost surely, 2^817630393 is an apocalyptic number.

It is an amenable number.

817630393 is a deficient number, since it is larger than the sum of its proper divisors (1).

817630393 is an equidigital number, since it uses as much as digits as its factorization.

817630393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 817630393 is about 28594.2370592398. The cubic root of 817630393 is about 935.0876953597.

The spelling of 817630393 in words is "eight hundred seventeen million, six hundred thirty thousand, three hundred ninety-three".