19438313 has 2 divisors, whose sum is σ = 19438314. Its totient is φ = 19438312.

The previous prime is 19438303. The next prime is 19438343. The reversal of 19438313 is 31383491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 3052009 = 4048^2 + 1747^2 .

It is a cyclic number.

It is not a de Polignac number, because 19438313 - 2⁶ = 19438249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19438313.

It is not a weakly prime, because it can be changed into another prime (19438303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9719156 + 9719157.

It is an arithmetic number, because the mean of its divisors is an integer number (9719157).

Almost surely, 2^19438313 is an apocalyptic number.

It is an amenable number.

19438313 is a deficient number, since it is larger than the sum of its proper divisors (1).

19438313 is an equidigital number, since it uses as much as digits as its factorization.

19438313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 19438313 is about 4408.8902231741. The cubic root of 19438313 is about 268.8765066571.

The spelling of 19438313 in words is "nineteen million, four hundred thirty-eight thousand, three hundred thirteen".