402306643 has 2 divisors, whose sum is σ = 402306644. Its totient is φ = 402306642.

The previous prime is 402306607. The next prime is 402306677. The reversal of 402306643 is 346603204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402306643 - 2⁹ = 402306131 is a prime.

It is equal to p_21452626 and since 402306643 and 21452626 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (402306043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201153321 + 201153322.

It is an arithmetic number, because the mean of its divisors is an integer number (201153322).

Almost surely, 2^402306643 is an apocalyptic number.

402306643 is a deficient number, since it is larger than the sum of its proper divisors (1).

402306643 is an equidigital number, since it uses as much as digits as its factorization.

402306643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 402306643 is about 20057.5831794362. The cubic root of 402306643 is about 738.2198769298.

Adding to 402306643 its reverse (346603204), we get a palindrome (748909847).

The spelling of 402306643 in words is "four hundred two million, three hundred six thousand, six hundred forty-three".