18386761 has 2 divisors, whose sum is σ = 18386762. Its totient is φ = 18386760.

The previous prime is 18386723. The next prime is 18386779. The reversal of 18386761 is 16768381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10791225 + 7595536 = 3285^2 + 2756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18386761 is a prime.

It is a super-2 number, since 2×18386761² = 676145960142242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18386791) 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, 9193380 + 9193381.

It is an arithmetic number, because the mean of its divisors is an integer number (9193381).

Almost surely, 2^18386761 is an apocalyptic number.

It is an amenable number.

18386761 is a deficient number, since it is larger than the sum of its proper divisors (1).

18386761 is an equidigital number, since it uses as much as digits as its factorization.

18386761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 18386761 is about 4287.9786613275. The cubic root of 18386761 is about 263.9378919171.

The spelling of 18386761 in words is "eighteen million, three hundred eighty-six thousand, seven hundred sixty-one".