18874643 has 2 divisors, whose sum is σ = 18874644. Its totient is φ = 18874642.

The previous prime is 18874633. The next prime is 18874649. The reversal of 18874643 is 34647881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18874643 - 2¹⁸ = 18612499 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18874643.

It is not a weakly prime, because it can be changed into another prime (18874649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9437321 + 9437322.

It is an arithmetic number, because the mean of its divisors is an integer number (9437322).

Almost surely, 2^18874643 is an apocalyptic number.

18874643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18874643 is an equidigital number, since it uses as much as digits as its factorization.

18874643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 41.

The square root of 18874643 is about 4344.4957129683. The cubic root of 18874643 is about 266.2520224376.

The spelling of 18874643 in words is "eighteen million, eight hundred seventy-four thousand, six hundred forty-three".