18728741 has 2 divisors, whose sum is σ = 18728742. Its totient is φ = 18728740.

The previous prime is 18728729. The next prime is 18728753. The reversal of 18728741 is 14782781.

It is a balanced prime because it is at equal distance from previous prime (18728729) and next prime (18728753).

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 2163841 = 4070^2 + 1471^2 .

It is a cyclic number.

It is not a de Polignac number, because 18728741 - 2²² = 14534437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18728695 and 18728704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18728761) 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, 9364370 + 9364371.

It is an arithmetic number, because the mean of its divisors is an integer number (9364371).

Almost surely, 2^18728741 is an apocalyptic number.

It is an amenable number.

18728741 is a deficient number, since it is larger than the sum of its proper divisors (1).

18728741 is an equidigital number, since it uses as much as digits as its factorization.

18728741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 38.

The square root of 18728741 is about 4327.6715448379. The cubic root of 18728741 is about 265.5641996205.

It can be divided in two parts, 187287 and 41, that multiplied together give a palindrome (7678767).

The spelling of 18728741 in words is "eighteen million, seven hundred twenty-eight thousand, seven hundred forty-one".