18387214 has 4 divisors (see below), whose sum is σ = 27580824. Its totient is φ = 9193606.

The previous prime is 18387211. The next prime is 18387221. The reversal of 18387214 is 41278381.

It is a happy number.

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

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18387214.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18387211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4596802 + ... + 4596805.

It is an arithmetic number, because the mean of its divisors is an integer number (6895206).

Almost surely, 2^18387214 is an apocalyptic number.

18387214 is a deficient number, since it is larger than the sum of its proper divisors (9193610).

18387214 is an equidigital number, since it uses as much as digits as its factorization.

18387214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9193609.

The product of its digits is 10752, while the sum is 34.

The square root of 18387214 is about 4288.0314830934. The cubic root of 18387214 is about 263.9400594710.

The spelling of 18387214 in words is "eighteen million, three hundred eighty-seven thousand, two hundred fourteen".