18868693 has 2 divisors, whose sum is σ = 18868694. Its totient is φ = 18868692.

The previous prime is 18868669. The next prime is 18868697. The reversal of 18868693 is 39686881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10614564 + 8254129 = 3258^2 + 2873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18868693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18868697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434346 + 9434347.

It is an arithmetic number, because the mean of its divisors is an integer number (9434347).

Almost surely, 2^18868693 is an apocalyptic number.

It is an amenable number.

18868693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18868693 is an equidigital number, since it uses as much as digits as its factorization.

18868693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 18868693 is about 4343.8108844654. The cubic root of 18868693 is about 266.2240419343.

The spelling of 18868693 in words is "eighteen million, eight hundred sixty-eight thousand, six hundred ninety-three".