19994089 has 2 divisors, whose sum is σ = 19994090. Its totient is φ = 19994088.

The previous prime is 19994087. The next prime is 19994113. The reversal of 19994089 is 98049991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19954089 + 40000 = 4467^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 19994089 - 2¹ = 19994087 is a prime.

Together with 19994087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19994087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997044 + 9997045.

It is an arithmetic number, because the mean of its divisors is an integer number (9997045).

Almost surely, 2^19994089 is an apocalyptic number.

It is an amenable number.

19994089 is a deficient number, since it is larger than the sum of its proper divisors (1).

19994089 is an equidigital number, since it uses as much as digits as its factorization.

19994089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 19994089 is about 4471.4750362716. The cubic root of 19994089 is about 271.4150174870.

The spelling of 19994089 in words is "nineteen million, nine hundred ninety-four thousand, eighty-nine".