18783049 has 2 divisors, whose sum is σ = 18783050. Its totient is φ = 18783048.

The previous prime is 18783047. The next prime is 18783109. The reversal of 18783049 is 94038781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13801225 + 4981824 = 3715^2 + 2232^2 .

It is a cyclic number.

It is not a de Polignac number, because 18783049 - 2¹ = 18783047 is a prime.

Together with 18783047, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18783047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9391524 + 9391525.

It is an arithmetic number, because the mean of its divisors is an integer number (9391525).

Almost surely, 2^18783049 is an apocalyptic number.

It is an amenable number.

18783049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18783049 is an equidigital number, since it uses as much as digits as its factorization.

18783049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18783049 is about 4333.9415086039. The cubic root of 18783049 is about 265.8206386913.

The spelling of 18783049 in words is "eighteen million, seven hundred eighty-three thousand, forty-nine".