18783673 has 2 divisors, whose sum is σ = 18783674. Its totient is φ = 18783672.

The previous prime is 18783671. The next prime is 18783731. The reversal of 18783673 is 37638781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15657849 + 3125824 = 3957^2 + 1768^2 .

It is a cyclic number.

It is not a de Polignac number, because 18783673 - 2¹ = 18783671 is a prime.

Together with 18783671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18783671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9391836 + 9391837.

It is an arithmetic number, because the mean of its divisors is an integer number (9391837).

Almost surely, 2^18783673 is an apocalyptic number.

It is an amenable number.

18783673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18783673 is an equidigital number, since it uses as much as digits as its factorization.

18783673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The square root of 18783673 is about 4334.0134979024. The cubic root of 18783673 is about 265.8235823072.

The spelling of 18783673 in words is "eighteen million, seven hundred eighty-three thousand, six hundred seventy-three".