18027761 has 2 divisors, whose sum is σ = 18027762. Its totient is φ = 18027760.

The previous prime is 18027731. The next prime is 18027767. The reversal of 18027761 is 16772081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12737761 + 5290000 = 3569^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 18027761 - 2⁶ = 18027697 is a prime.

It is not a weakly prime, because it can be changed into another prime (18027767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9013880 + 9013881.

It is an arithmetic number, because the mean of its divisors is an integer number (9013881).

Almost surely, 2^18027761 is an apocalyptic number.

It is an amenable number.

18027761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18027761 is an equidigital number, since it uses as much as digits as its factorization.

18027761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 18027761 is about 4245.9110918624. The cubic root of 18027761 is about 262.2088005901.

The spelling of 18027761 in words is "eighteen million, twenty-seven thousand, seven hundred sixty-one".