19923443 has 2 divisors, whose sum is σ = 19923444. Its totient is φ = 19923442.

The previous prime is 19923391. The next prime is 19923467. The reversal of 19923443 is 34432991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19923443 - 2²² = 15729139 is a prime.

It is not a weakly prime, because it can be changed into another prime (19922443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9961721 + 9961722.

It is an arithmetic number, because the mean of its divisors is an integer number (9961722).

Almost surely, 2^19923443 is an apocalyptic number.

19923443 is a deficient number, since it is larger than the sum of its proper divisors (1).

19923443 is an equidigital number, since it uses as much as digits as its factorization.

19923443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 19923443 is about 4463.5684155169. The cubic root of 19923443 is about 271.0949726812.

The spelling of 19923443 in words is "nineteen million, nine hundred twenty-three thousand, four hundred forty-three".