19928339 has 2 divisors, whose sum is σ = 19928340. Its totient is φ = 19928338.

The previous prime is 19928333. The next prime is 19928347. The reversal of 19928339 is 93382991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19928339 - 2¹² = 19924243 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19928339.

It is not a weakly prime, because it can be changed into another prime (19928333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9964169 + 9964170.

It is an arithmetic number, because the mean of its divisors is an integer number (9964170).

Almost surely, 2^19928339 is an apocalyptic number.

19928339 is a deficient number, since it is larger than the sum of its proper divisors (1).

19928339 is an equidigital number, since it uses as much as digits as its factorization.

19928339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 19928339 is about 4464.1168219481. The cubic root of 19928339 is about 271.1171772148.

The spelling of 19928339 in words is "nineteen million, nine hundred twenty-eight thousand, three hundred thirty-nine".