19247440427 has 2 divisors, whose sum is σ = 19247440428. Its totient is φ = 19247440426.

The previous prime is 19247440397. The next prime is 19247440453. The reversal of 19247440427 is 72404474291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19247440427 - 2¹⁸ = 19247178283 is a prime.

It is not a weakly prime, because it can be changed into another prime (19247440327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9623720213 + 9623720214.

It is an arithmetic number, because the mean of its divisors is an integer number (9623720214).

Almost surely, 2^19247440427 is an apocalyptic number.

19247440427 is a deficient number, since it is larger than the sum of its proper divisors (1).

19247440427 is an equidigital number, since it uses as much as digits as its factorization.

19247440427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 44.

The spelling of 19247440427 in words is "nineteen billion, two hundred forty-seven million, four hundred forty thousand, four hundred twenty-seven".