402568643 has 2 divisors, whose sum is σ = 402568644. Its totient is φ = 402568642.

The previous prime is 402568631. The next prime is 402568667. The reversal of 402568643 is 346865204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402568643 - 2¹⁰ = 402567619 is a prime.

It is a super-2 number, since 2×402568643² = 324123024653722898, which contains 22 as substring.

It is equal to p_21465857 and since 402568643 and 21465857 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 402568597 and 402568606.

It is not a weakly prime, because it can be changed into another prime (402568693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201284321 + 201284322.

It is an arithmetic number, because the mean of its divisors is an integer number (201284322).

Almost surely, 2^402568643 is an apocalyptic number.

402568643 is a deficient number, since it is larger than the sum of its proper divisors (1).

402568643 is an equidigital number, since it uses as much as digits as its factorization.

402568643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 402568643 is about 20064.1133120804. The cubic root of 402568643 is about 738.3800960394.

The spelling of 402568643 in words is "four hundred two million, five hundred sixty-eight thousand, six hundred forty-three".