18214646 has 4 divisors (see below), whose sum is σ = 27321972. Its totient is φ = 9107322.

The previous prime is 18214631. The next prime is 18214727. The reversal of 18214646 is 64641281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64641281 = 73 ⋅885497.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4553660 + ... + 4553663.

It is an arithmetic number, because the mean of its divisors is an integer number (6830493).

Almost surely, 2^18214646 is an apocalyptic number.

18214646 is a deficient number, since it is larger than the sum of its proper divisors (9107326).

18214646 is an equidigital number, since it uses as much as digits as its factorization.

18214646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9107325.

The product of its digits is 9216, while the sum is 32.

The square root of 18214646 is about 4267.8619940200. The cubic root of 18214646 is about 263.1117511473. Note that the first 3 decimals are identical.

The spelling of 18214646 in words is "eighteen million, two hundred fourteen thousand, six hundred forty-six".