19479847 has 2 divisors, whose sum is σ = 19479848. Its totient is φ = 19479846.

The previous prime is 19479839. The next prime is 19479869. The reversal of 19479847 is 74897491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19479847 - 2³ = 19479839 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 19479847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19479947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9739923 + 9739924.

It is an arithmetic number, because the mean of its divisors is an integer number (9739924).

Almost surely, 2^19479847 is an apocalyptic number.

19479847 is a deficient number, since it is larger than the sum of its proper divisors (1).

19479847 is an equidigital number, since it uses as much as digits as its factorization.

19479847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 19479847 is about 4413.5979653793. The cubic root of 19479847 is about 269.0678739558.

The spelling of 19479847 in words is "nineteen million, four hundred seventy-nine thousand, eight hundred forty-seven".