18678587 has 2 divisors, whose sum is σ = 18678588. Its totient is φ = 18678586.

The previous prime is 18678559. The next prime is 18678589. The reversal of 18678587 is 78587681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18678587 - 2²⁴ = 1901371 is a prime.

It is a super-2 number, since 2×18678587² = 697779224633138, which contains 22 as substring.

Together with 18678589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18678589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9339293 + 9339294.

It is an arithmetic number, because the mean of its divisors is an integer number (9339294).

Almost surely, 2^18678587 is an apocalyptic number.

18678587 is a deficient number, since it is larger than the sum of its proper divisors (1).

18678587 is an equidigital number, since it uses as much as digits as its factorization.

18678587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 50.

The square root of 18678587 is about 4321.8730892982. The cubic root of 18678587 is about 265.3269348067.

The spelling of 18678587 in words is "eighteen million, six hundred seventy-eight thousand, five hundred eighty-seven".