19838989 has 2 divisors, whose sum is σ = 19838990. Its totient is φ = 19838988.

The previous prime is 19838971. The next prime is 19839007. The reversal of 19838989 is 98983891.

It is a balanced prime because it is at equal distance from previous prime (19838971) and next prime (19839007).

It can be written as a sum of positive squares in only one way, i.e., 13875625 + 5963364 = 3725^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 19838989 - 2¹¹ = 19836941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19838939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9919494 + 9919495.

It is an arithmetic number, because the mean of its divisors is an integer number (9919495).

Almost surely, 2^19838989 is an apocalyptic number.

It is an amenable number.

19838989 is a deficient number, since it is larger than the sum of its proper divisors (1).

19838989 is an equidigital number, since it uses as much as digits as its factorization.

19838989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 55.

The square root of 19838989 is about 4454.0980007180. The cubic root of 19838989 is about 270.7113796551.

The spelling of 19838989 in words is "nineteen million, eight hundred thirty-eight thousand, nine hundred eighty-nine".