18871087 has 2 divisors, whose sum is σ = 18871088. Its totient is φ = 18871086.

The previous prime is 18871081. The next prime is 18871093. The reversal of 18871087 is 78017881.

It is a balanced prime because it is at equal distance from previous prime (18871081) and next prime (18871093).

It is a cyclic number.

It is not a de Polignac number, because 18871087 - 2³ = 18871079 is a prime.

It is a super-2 number, since 2×18871087² = 712235849123138, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18871081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9435543 + 9435544.

It is an arithmetic number, because the mean of its divisors is an integer number (9435544).

Almost surely, 2^18871087 is an apocalyptic number.

18871087 is a deficient number, since it is larger than the sum of its proper divisors (1).

18871087 is an equidigital number, since it uses as much as digits as its factorization.

18871087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 18871087 is about 4344.0864402081. The cubic root of 18871087 is about 266.2353006792.

The spelling of 18871087 in words is "eighteen million, eight hundred seventy-one thousand, eighty-seven".