18473887 has 2 divisors, whose sum is σ = 18473888. Its totient is φ = 18473886.

The previous prime is 18473879. The next prime is 18473963. The reversal of 18473887 is 78837481.

It is a weak prime.

It is an emirp because it is prime and its reverse (78837481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18473887 - 2³ = 18473879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18473857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9236943 + 9236944.

It is an arithmetic number, because the mean of its divisors is an integer number (9236944).

Almost surely, 2^18473887 is an apocalyptic number.

18473887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18473887 is an equidigital number, since it uses as much as digits as its factorization.

18473887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 46.

The square root of 18473887 is about 4298.1259869855. The cubic root of 18473887 is about 264.3541266562.

The spelling of 18473887 in words is "eighteen million, four hundred seventy-three thousand, eight hundred eighty-seven".