18879643 has 2 divisors, whose sum is σ = 18879644. Its totient is φ = 18879642.

The previous prime is 18879631. The next prime is 18879661. The reversal of 18879643 is 34697881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18879643 - 2⁹ = 18879131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18879593 and 18879602.

It is not a weakly prime, because it can be changed into another prime (18879143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439821 + 9439822.

It is an arithmetic number, because the mean of its divisors is an integer number (9439822).

Almost surely, 2^18879643 is an apocalyptic number.

18879643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18879643 is an equidigital number, since it uses as much as digits as its factorization.

18879643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 18879643 is about 4345.0711156436. The cubic root of 18879643 is about 266.2755309189.

The spelling of 18879643 in words is "eighteen million, eight hundred seventy-nine thousand, six hundred forty-three".