646830427 has 2 divisors, whose sum is σ = 646830428. Its totient is φ = 646830426.

The previous prime is 646830409. The next prime is 646830439. The reversal of 646830427 is 724038646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646830427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646830427.

It is not a weakly prime, because it can be changed into another prime (646830487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323415213 + 323415214.

It is an arithmetic number, because the mean of its divisors is an integer number (323415214).

Almost surely, 2^646830427 is an apocalyptic number.

646830427 is a deficient number, since it is larger than the sum of its proper divisors (1).

646830427 is an equidigital number, since it uses as much as digits as its factorization.

646830427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 646830427 is about 25432.8611642497. The cubic root of 646830427 is about 864.8288063763.

The spelling of 646830427 in words is "six hundred forty-six million, eight hundred thirty thousand, four hundred twenty-seven".