19389913 has 2 divisors, whose sum is σ = 19389914. Its totient is φ = 19389912.

The previous prime is 19389907. The next prime is 19389919. The reversal of 19389913 is 31998391.

It is a balanced prime because it is at equal distance from previous prime (19389907) and next prime (19389919).

It can be written as a sum of positive squares in only one way, i.e., 18636489 + 753424 = 4317^2 + 868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19389913 is a prime.

It is a super-2 number, since 2×19389913² = 751937452295138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19389913.

It is not a weakly prime, because it can be changed into another prime (19389919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9694956 + 9694957.

It is an arithmetic number, because the mean of its divisors is an integer number (9694957).

Almost surely, 2^19389913 is an apocalyptic number.

It is an amenable number.

19389913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19389913 is an equidigital number, since it uses as much as digits as its factorization.

19389913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 43.

The square root of 19389913 is about 4403.3978925371. The cubic root of 19389913 is about 268.6531601338.

It can be divided in two parts, 19389 and 913, that added together give a palindrome (20302).

The spelling of 19389913 in words is "nineteen million, three hundred eighty-nine thousand, nine hundred thirteen".