19479947 has 2 divisors, whose sum is σ = 19479948. Its totient is φ = 19479946.

The previous prime is 19479937. The next prime is 19479979. The reversal of 19479947 is 74997491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19479947 - 2⁴ = 19479931 is a prime.

It is a super-3 number, since 3×19479947³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19479895 and 19479904.

It is not a weakly prime, because it can be changed into another prime (19479917) 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, 9739973 + 9739974.

It is an arithmetic number, because the mean of its divisors is an integer number (9739974).

Almost surely, 2^19479947 is an apocalyptic number.

19479947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19479947 is an equidigital number, since it uses as much as digits as its factorization.

19479947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 19479947 is about 4413.6092939906. The cubic root of 19479947 is about 269.0683343759.

The spelling of 19479947 in words is "nineteen million, four hundred seventy-nine thousand, nine hundred forty-seven".