19894289 has 2 divisors, whose sum is σ = 19894290. Its totient is φ = 19894288.

The previous prime is 19894283. The next prime is 19894291. The reversal of 19894289 is 98249891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19509889 + 384400 = 4417^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 19894289 - 2²⁰ = 18845713 is a prime.

Together with 19894291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19894283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9947144 + 9947145.

It is an arithmetic number, because the mean of its divisors is an integer number (9947145).

Almost surely, 2^19894289 is an apocalyptic number.

It is an amenable number.

19894289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19894289 is an equidigital number, since it uses as much as digits as its factorization.

19894289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 50.

The square root of 19894289 is about 4460.3014472118. The cubic root of 19894289 is about 270.9626769222.

The spelling of 19894289 in words is "nineteen million, eight hundred ninety-four thousand, two hundred eighty-nine".