19390249 has 2 divisors, whose sum is σ = 19390250. Its totient is φ = 19390248.

The previous prime is 19390247. The next prime is 19390271. The reversal of 19390249 is 94209391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18429849 + 960400 = 4293^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 19390249 - 2¹ = 19390247 is a prime.

Together with 19390247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19390247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9695124 + 9695125.

It is an arithmetic number, because the mean of its divisors is an integer number (9695125).

Almost surely, 2^19390249 is an apocalyptic number.

It is an amenable number.

19390249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19390249 is an equidigital number, since it uses as much as digits as its factorization.

19390249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 19390249 is about 4403.4360447269. The cubic root of 19390249 is about 268.6547119190.

The spelling of 19390249 in words is "nineteen million, three hundred ninety thousand, two hundred forty-nine".