18168793 has 2 divisors, whose sum is σ = 18168794. Its totient is φ = 18168792.

The previous prime is 18168791. The next prime is 18168811. The reversal of 18168793 is 39786181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16297369 + 1871424 = 4037^2 + 1368^2 .

It is a cyclic number.

It is not a de Polignac number, because 18168793 - 2¹ = 18168791 is a prime.

Together with 18168791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18168791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9084396 + 9084397.

It is an arithmetic number, because the mean of its divisors is an integer number (9084397).

Almost surely, 2^18168793 is an apocalyptic number.

It is an amenable number.

18168793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168793 is an equidigital number, since it uses as much as digits as its factorization.

18168793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 18168793 is about 4262.4867155218. The cubic root of 18168793 is about 262.8907824302.

It can be divided in two parts, 1816 and 8793, that added together give a square (10609 = 103²).

The spelling of 18168793 in words is "eighteen million, one hundred sixty-eight thousand, seven hundred ninety-three".