19309728947 has 2 divisors, whose sum is σ = 19309728948. Its totient is φ = 19309728946.

The previous prime is 19309728931. The next prime is 19309729003. The reversal of 19309728947 is 74982790391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19309728947 - 2⁴ = 19309728931 is a prime.

It is not a weakly prime, because it can be changed into another prime (19309728247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9654864473 + 9654864474.

It is an arithmetic number, because the mean of its divisors is an integer number (9654864474).

Almost surely, 2^19309728947 is an apocalyptic number.

19309728947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19309728947 is an equidigital number, since it uses as much as digits as its factorization.

19309728947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 19309728947 in words is "nineteen billion, three hundred nine million, seven hundred twenty-eight thousand, nine hundred forty-seven".