19230749 has 2 divisors, whose sum is σ = 19230750. Its totient is φ = 19230748.

The previous prime is 19230727. The next prime is 19230767. The reversal of 19230749 is 94703291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 611524 = 4315^2 + 782^2 .

It is an emirp because it is prime and its reverse (94703291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19230749 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19230779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9615374 + 9615375.

It is an arithmetic number, because the mean of its divisors is an integer number (9615375).

Almost surely, 2^19230749 is an apocalyptic number.

It is an amenable number.

19230749 is a deficient number, since it is larger than the sum of its proper divisors (1).

19230749 is an equidigital number, since it uses as much as digits as its factorization.

19230749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 19230749 is about 4385.2877898719. The cubic root of 19230749 is about 267.9160509693.

The spelling of 19230749 in words is "nineteen million, two hundred thirty thousand, seven hundred forty-nine".