18946223 has 4 divisors (see below), whose sum is σ = 19408368. Its totient is φ = 18484080.

The previous prime is 18946171. The next prime is 18946237. The reversal of 18946223 is 32264981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18946223 - 2⁶ = 18946159 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 (18946723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231011 + ... + 231092.

It is an arithmetic number, because the mean of its divisors is an integer number (4852092).

Almost surely, 2^18946223 is an apocalyptic number.

18946223 is a deficient number, since it is larger than the sum of its proper divisors (462145).

18946223 is an equidigital number, since it uses as much as digits as its factorization.

18946223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462144.

The product of its digits is 20736, while the sum is 35.

The square root of 18946223 is about 4352.7259275080. The cubic root of 18946223 is about 266.5881749890.

The spelling of 18946223 in words is "eighteen million, nine hundred forty-six thousand, two hundred twenty-three".