18942223 has 2 divisors, whose sum is σ = 18942224. Its totient is φ = 18942222.

The previous prime is 18942211. The next prime is 18942239. The reversal of 18942223 is 32224981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18942223 - 2¹³ = 18934031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18942263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9471111 + 9471112.

It is an arithmetic number, because the mean of its divisors is an integer number (9471112).

Almost surely, 2^18942223 is an apocalyptic number.

18942223 is a deficient number, since it is larger than the sum of its proper divisors (1).

18942223 is an equidigital number, since it uses as much as digits as its factorization.

18942223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 18942223 is about 4352.2664210730. The cubic root of 18942223 is about 266.5694126258.

The spelling of 18942223 in words is "eighteen million, nine hundred forty-two thousand, two hundred twenty-three".