18713449 has 2 divisors, whose sum is σ = 18713450. Its totient is φ = 18713448.

The previous prime is 18713437. The next prime is 18713459. The reversal of 18713449 is 94431781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14197824 + 4515625 = 3768^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 18713449 - 2¹³ = 18705257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18713459) 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, 9356724 + 9356725.

It is an arithmetic number, because the mean of its divisors is an integer number (9356725).

Almost surely, 2^18713449 is an apocalyptic number.

It is an amenable number.

18713449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18713449 is an equidigital number, since it uses as much as digits as its factorization.

18713449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 18713449 is about 4325.9044141081. The cubic root of 18713449 is about 265.4919022975.

The spelling of 18713449 in words is "eighteen million, seven hundred thirteen thousand, four hundred forty-nine".