19949393 has 2 divisors, whose sum is σ = 19949394. Its totient is φ = 19949392.

The previous prime is 19949387. The next prime is 19949429. The reversal of 19949393 is 39394991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17032129 + 2917264 = 4127^2 + 1708^2 .

It is a cyclic number.

It is not a de Polignac number, because 19949393 - 2¹⁴ = 19933009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19949333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9974696 + 9974697.

It is an arithmetic number, because the mean of its divisors is an integer number (9974697).

Almost surely, 2^19949393 is an apocalyptic number.

It is an amenable number.

19949393 is a deficient number, since it is larger than the sum of its proper divisors (1).

19949393 is an equidigital number, since it uses as much as digits as its factorization.

19949393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 47.

The square root of 19949393 is about 4466.4743366553. The cubic root of 19949393 is about 271.2126207279.

The spelling of 19949393 in words is "nineteen million, nine hundred forty-nine thousand, three hundred ninety-three".