18561214 has 16 divisors (see below), whose sum is σ = 33494400. Its totient is φ = 7536024.

The previous prime is 18561209. The next prime is 18561227. The reversal of 18561214 is 41216581.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34624 + ... + 35155.

It is an arithmetic number, because the mean of its divisors is an integer number (2093400).

Almost surely, 2^18561214 is an apocalyptic number.

18561214 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18561214 is a deficient number, since it is larger than the sum of its proper divisors (14933186).

18561214 is a wasteful number, since it uses less digits than its factorization.

18561214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69807.

The product of its digits is 1920, while the sum is 28.

The square root of 18561214 is about 4308.2727397415. The cubic root of 18561214 is about 264.7700104925.

Adding to 18561214 its reverse (41216581), we get a palindrome (59777795).

The spelling of 18561214 in words is "eighteen million, five hundred sixty-one thousand, two hundred fourteen".