18378223 has 2 divisors, whose sum is σ = 18378224. Its totient is φ = 18378222.

The previous prime is 18378221. The next prime is 18378229. The reversal of 18378223 is 32287381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18378223 - 2¹ = 18378221 is a prime.

Together with 18378221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18378221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9189111 + 9189112.

It is an arithmetic number, because the mean of its divisors is an integer number (9189112).

Almost surely, 2^18378223 is an apocalyptic number.

18378223 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378223 is an equidigital number, since it uses as much as digits as its factorization.

18378223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 18378223 is about 4286.9829717413. The cubic root of 18378223 is about 263.8970318907.

The spelling of 18378223 in words is "eighteen million, three hundred seventy-eight thousand, two hundred twenty-three".