19481393 has 2 divisors, whose sum is σ = 19481394. Its totient is φ = 19481392.

The previous prime is 19481381. The next prime is 19481401. The reversal of 19481393 is 39318491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 2900209 = 4072^2 + 1703^2 .

It is an emirp because it is prime and its reverse (39318491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19481393 - 2¹⁴ = 19465009 is a prime.

It is not a weakly prime, because it can be changed into another prime (19481333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9740696 + 9740697.

It is an arithmetic number, because the mean of its divisors is an integer number (9740697).

Almost surely, 2^19481393 is an apocalyptic number.

It is an amenable number.

19481393 is a deficient number, since it is larger than the sum of its proper divisors (1).

19481393 is an equidigital number, since it uses as much as digits as its factorization.

19481393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 19481393 is about 4413.7731024601. The cubic root of 19481393 is about 269.0749918749.

The spelling of 19481393 in words is "nineteen million, four hundred eighty-one thousand, three hundred ninety-three".