18448387 has 2 divisors, whose sum is σ = 18448388. Its totient is φ = 18448386.

The previous prime is 18448361. The next prime is 18448403. The reversal of 18448387 is 78384481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18448387 is a prime.

It is not a weakly prime, because it can be changed into another prime (18448307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9224193 + 9224194.

It is an arithmetic number, because the mean of its divisors is an integer number (9224194).

Almost surely, 2^18448387 is an apocalyptic number.

18448387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18448387 is an equidigital number, since it uses as much as digits as its factorization.

18448387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172032, while the sum is 43.

The square root of 18448387 is about 4295.1585535344. The cubic root of 18448387 is about 264.2324389605.

The spelling of 18448387 in words is "eighteen million, four hundred forty-eight thousand, three hundred eighty-seven".