18742741 has 2 divisors, whose sum is σ = 18742742. Its totient is φ = 18742740.

The previous prime is 18742739. The next prime is 18742819. The reversal of 18742741 is 14724781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18740241 + 2500 = 4329^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 18742741 - 2¹ = 18742739 is a prime.

Together with 18742739, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18742697 and 18742706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18742541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371370 + 9371371.

It is an arithmetic number, because the mean of its divisors is an integer number (9371371).

Almost surely, 2^18742741 is an apocalyptic number.

It is an amenable number.

18742741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742741 is an equidigital number, since it uses as much as digits as its factorization.

18742741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 34.

The square root of 18742741 is about 4329.2887406594. The cubic root of 18742741 is about 265.6303541435.

The spelling of 18742741 in words is "eighteen million, seven hundred forty-two thousand, seven hundred forty-one".