19974289 has 2 divisors, whose sum is σ = 19974290. Its totient is φ = 19974288.

The previous prime is 19974287. The next prime is 19974299. The reversal of 19974289 is 98247991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 6225025 = 3708^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 19974289 - 2¹ = 19974287 is a prime.

Together with 19974287, 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 (19974287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987144 + 9987145.

It is an arithmetic number, because the mean of its divisors is an integer number (9987145).

Almost surely, 2^19974289 is an apocalyptic number.

It is an amenable number.

19974289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19974289 is an equidigital number, since it uses as much as digits as its factorization.

19974289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 49.

The square root of 19974289 is about 4469.2604533636. The cubic root of 19974289 is about 271.3253944611.

The spelling of 19974289 in words is "nineteen million, nine hundred seventy-four thousand, two hundred eighty-nine".