18862643 has 2 divisors, whose sum is σ = 18862644. Its totient is φ = 18862642.

The previous prime is 18862631. The next prime is 18862667. The reversal of 18862643 is 34626881.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (34626881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18862643 - 2²⁰ = 17814067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18862597 and 18862606.

It is not a weakly prime, because it can be changed into another prime (18862693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9431321 + 9431322.

It is an arithmetic number, because the mean of its divisors is an integer number (9431322).

Almost surely, 2^18862643 is an apocalyptic number.

18862643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18862643 is an equidigital number, since it uses as much as digits as its factorization.

18862643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 18862643 is about 4343.1144355174. The cubic root of 18862643 is about 266.1955851385.

The spelling of 18862643 in words is "eighteen million, eight hundred sixty-two thousand, six hundred forty-three".