18745387 has 2 divisors, whose sum is σ = 18745388. Its totient is φ = 18745386.

The previous prime is 18745369. The next prime is 18745393. The reversal of 18745387 is 78354781.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18745387 is a prime.

It is not a weakly prime, because it can be changed into another prime (18745087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372693 + 9372694.

It is an arithmetic number, because the mean of its divisors is an integer number (9372694).

Almost surely, 2^18745387 is an apocalyptic number.

18745387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18745387 is an equidigital number, since it uses as much as digits as its factorization.

18745387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 43.

The square root of 18745387 is about 4329.5943227975. The cubic root of 18745387 is about 265.6428536466.

The spelling of 18745387 in words is "eighteen million, seven hundred forty-five thousand, three hundred eighty-seven".