18214987 has 16 divisors (see below), whose sum is σ = 21954240. Its totient is φ = 14781312.

The previous prime is 18214981. The next prime is 18215003. The reversal of 18214987 is 78941281.

It is a happy number.

It is not a de Polignac number, because 18214987 - 2²³ = 9826379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18214981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9913 + ... + 11605.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^18214987 is an apocalyptic number.

18214987 is a deficient number, since it is larger than the sum of its proper divisors (3739253).

18214987 is a wasteful number, since it uses less digits than its factorization.

18214987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782.

The product of its digits is 32256, while the sum is 40.

The square root of 18214987 is about 4267.9019435784. The cubic root of 18214987 is about 263.1133930595.

The spelling of 18214987 in words is "eighteen million, two hundred fourteen thousand, nine hundred eighty-seven".