19959223 has 2 divisors, whose sum is σ = 19959224. Its totient is φ = 19959222.

The previous prime is 19959211. The next prime is 19959263. The reversal of 19959223 is 32295991.

It is an a-pointer prime, because the next prime (19959263) can be obtained adding 19959223 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19959223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19959263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9979611 + 9979612.

It is an arithmetic number, because the mean of its divisors is an integer number (9979612).

Almost surely, 2^19959223 is an apocalyptic number.

19959223 is a deficient number, since it is larger than the sum of its proper divisors (1).

19959223 is an equidigital number, since it uses as much as digits as its factorization.

19959223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 40.

The square root of 19959223 is about 4467.5746216488. The cubic root of 19959223 is about 271.2571597988.

The spelling of 19959223 in words is "nineteen million, nine hundred fifty-nine thousand, two hundred twenty-three".