18728323 has 2 divisors, whose sum is σ = 18728324. Its totient is φ = 18728322.

The previous prime is 18728321. The next prime is 18728363. The reversal of 18728323 is 32382781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18728323 - 2¹ = 18728321 is a prime.

Together with 18728321, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18728321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364161 + 9364162.

It is an arithmetic number, because the mean of its divisors is an integer number (9364162).

Almost surely, 2^18728323 is an apocalyptic number.

18728323 is a deficient number, since it is larger than the sum of its proper divisors (1).

18728323 is an equidigital number, since it uses as much as digits as its factorization.

18728323 is an evil number, because the sum of its binary digits is even.

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

The square root of 18728323 is about 4327.6232507001. The cubic root of 18728323 is about 265.5622239286.

The spelling of 18728323 in words is "eighteen million, seven hundred twenty-eight thousand, three hundred twenty-three".