18486987 has 4 divisors (see below), whose sum is σ = 24649320. Its totient is φ = 12324656.

The previous prime is 18486977. The next prime is 18486997. The reversal of 18486987 is 78968481.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18486977) and next prime (18486997).

It is a cyclic number.

It is not a de Polignac number, because 18486987 - 2¹⁹ = 17962699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18486967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3081162 + ... + 3081167.

It is an arithmetic number, because the mean of its divisors is an integer number (6162330).

Almost surely, 2^18486987 is an apocalyptic number.

18486987 is a deficient number, since it is larger than the sum of its proper divisors (6162333).

18486987 is an equidigital number, since it uses as much as digits as its factorization.

18486987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6162332.

The product of its digits is 774144, while the sum is 51.

The square root of 18486987 is about 4299.6496368890. The cubic root of 18486987 is about 264.4165971914.

The spelling of 18486987 in words is "eighteen million, four hundred eighty-six thousand, nine hundred eighty-seven".