19992449 has 2 divisors, whose sum is σ = 19992450. Its totient is φ = 19992448.

The previous prime is 19992443. The next prime is 19992457. The reversal of 19992449 is 94429991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14554225 + 5438224 = 3815^2 + 2332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19992449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19992443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996224 + 9996225.

It is an arithmetic number, because the mean of its divisors is an integer number (9996225).

Almost surely, 2^19992449 is an apocalyptic number.

It is an amenable number.

19992449 is a deficient number, since it is larger than the sum of its proper divisors (1).

19992449 is an equidigital number, since it uses as much as digits as its factorization.

19992449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 19992449 is about 4471.2916478351. The cubic root of 19992449 is about 271.4075964137.

The spelling of 19992449 in words is "nineteen million, nine hundred ninety-two thousand, four hundred forty-nine".