18868361 has 2 divisors, whose sum is σ = 18868362. Its totient is φ = 18868360.

The previous prime is 18868309. The next prime is 18868373. The reversal of 18868361 is 16386881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 32761 = 4340^2 + 181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18868361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18868301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434180 + 9434181.

It is an arithmetic number, because the mean of its divisors is an integer number (9434181).

Almost surely, 2^18868361 is an apocalyptic number.

It is an amenable number.

18868361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868361 is an equidigital number, since it uses as much as digits as its factorization.

18868361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 18868361 is about 4343.7726690056. The cubic root of 18868361 is about 266.2224804960. Note that the first 3 decimals are identical.

The spelling of 18868361 in words is "eighteen million, eight hundred sixty-eight thousand, three hundred sixty-one".