18214789 has 4 divisors (see below), whose sum is σ = 18223660. Its totient is φ = 18205920.

The previous prime is 18214771. The next prime is 18214799. The reversal of 18214789 is 98741281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98741281 = 2803 ⋅35227.

It can be written as a sum of positive squares in 2 ways, for example, as 13264164 + 4950625 = 3642^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 18214789 - 2⁹ = 18214277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18214759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409 + ... + 6049.

It is an arithmetic number, because the mean of its divisors is an integer number (4555915).

Almost surely, 2^18214789 is an apocalyptic number.

It is an amenable number.

18214789 is a deficient number, since it is larger than the sum of its proper divisors (8871).

18214789 is an equidigital number, since it uses as much as digits as its factorization.

18214789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870.

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

The square root of 18214789 is about 4267.8787471061. The cubic root of 18214789 is about 263.1124396936.

The spelling of 18214789 in words is "eighteen million, two hundred fourteen thousand, seven hundred eighty-nine".