19854223 has 2 divisors, whose sum is σ = 19854224. Its totient is φ = 19854222.

The previous prime is 19854203. The next prime is 19854253. The reversal of 19854223 is 32245891.

It is a weak prime.

It is an emirp because it is prime and its reverse (32245891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19854223 - 2²¹ = 17757071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19854203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927111 + 9927112.

It is an arithmetic number, because the mean of its divisors is an integer number (9927112).

Almost surely, 2^19854223 is an apocalyptic number.

19854223 is a deficient number, since it is larger than the sum of its proper divisors (1).

19854223 is an equidigital number, since it uses as much as digits as its factorization.

19854223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 19854223 is about 4455.8077831073. The cubic root of 19854223 is about 270.7806533804.

The spelling of 19854223 in words is "nineteen million, eight hundred fifty-four thousand, two hundred twenty-three".