19928243 has 2 divisors, whose sum is σ = 19928244. Its totient is φ = 19928242.

The previous prime is 19928231. The next prime is 19928261. The reversal of 19928243 is 34282991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19928243 - 2¹² = 19924147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19928197 and 19928206.

It is not a weakly prime, because it can be changed into another prime (19928213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9964121 + 9964122.

It is an arithmetic number, because the mean of its divisors is an integer number (9964122).

Almost surely, 2^19928243 is an apocalyptic number.

19928243 is a deficient number, since it is larger than the sum of its proper divisors (1).

19928243 is an equidigital number, since it uses as much as digits as its factorization.

19928243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 19928243 is about 4464.1060695284. The cubic root of 19928243 is about 271.1167418667.

The spelling of 19928243 in words is "nineteen million, nine hundred twenty-eight thousand, two hundred forty-three".