18404214 has 32 divisors (see below), whose sum is σ = 37635840. Its totient is φ = 5998752.

The previous prime is 18404201. The next prime is 18404219. The reversal of 18404214 is 41240481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18404219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69847 + ... + 70109.

It is an arithmetic number, because the mean of its divisors is an integer number (1176120).

Almost surely, 2^18404214 is an apocalyptic number.

18404214 is an abundant number, since it is smaller than the sum of its proper divisors (19231626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18404214 is a wasteful number, since it uses less digits than its factorization.

18404214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 18404214 is about 4290.0132866927. The cubic root of 18404214 is about 264.0213768273.

Adding to 18404214 its reverse (41240481), we get a palindrome (59644695).

The spelling of 18404214 in words is "eighteen million, four hundred four thousand, two hundred fourteen".