19989413 has 2 divisors, whose sum is σ = 19989414. Its totient is φ = 19989412.

The previous prime is 19989391. The next prime is 19989457. The reversal of 19989413 is 31498991.

It is an a-pointer prime, because the next prime (19989457) can be obtained adding 19989413 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15856324 + 4133089 = 3982^2 + 2033^2 .

It is an emirp because it is prime and its reverse (31498991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19989413 - 2⁸ = 19989157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19989493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994706 + 9994707.

It is an arithmetic number, because the mean of its divisors is an integer number (9994707).

Almost surely, 2^19989413 is an apocalyptic number.

It is an amenable number.

19989413 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989413 is an equidigital number, since it uses as much as digits as its factorization.

19989413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 44.

The square root of 19989413 is about 4470.9521357313. The cubic root of 19989413 is about 271.3938573069.

It can be divided in two parts, 19989 and 413, that added together give a palindrome (20402).

The spelling of 19989413 in words is "nineteen million, nine hundred eighty-nine thousand, four hundred thirteen".