18168737 has 2 divisors, whose sum is σ = 18168738. Its totient is φ = 18168736.

The previous prime is 18168721. The next prime is 18168763. The reversal of 18168737 is 73786181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15241216 + 2927521 = 3904^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 18168737 - 2⁴ = 18168721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18168694 and 18168703.

It is not a weakly prime, because it can be changed into another prime (18168037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084368 + 9084369.

It is an arithmetic number, because the mean of its divisors is an integer number (9084369).

Almost surely, 2^18168737 is an apocalyptic number.

It is an amenable number.

18168737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168737 is an equidigital number, since it uses as much as digits as its factorization.

18168737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 18168737 is about 4262.4801465813. The cubic root of 18168737 is about 262.8905123352.

The spelling of 18168737 in words is "eighteen million, one hundred sixty-eight thousand, seven hundred thirty-seven".