18027731 has 2 divisors, whose sum is σ = 18027732. Its totient is φ = 18027730.

The previous prime is 18027727. The next prime is 18027761. The reversal of 18027731 is 13772081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18027731 - 2² = 18027727 is a prime.

It is a super-2 number, since 2×18027731² = 649998170016722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18027694 and 18027703.

It is not a weakly prime, because it can be changed into another prime (18027761) 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, 9013865 + 9013866.

It is an arithmetic number, because the mean of its divisors is an integer number (9013866).

Almost surely, 2^18027731 is an apocalyptic number.

18027731 is a deficient number, since it is larger than the sum of its proper divisors (1).

18027731 is an equidigital number, since it uses as much as digits as its factorization.

18027731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 18027731 is about 4245.9075590502. The cubic root of 18027731 is about 262.2086551428.

The spelling of 18027731 in words is "eighteen million, twenty-seven thousand, seven hundred thirty-one".