19964947 has 2 divisors, whose sum is σ = 19964948. Its totient is φ = 19964946.

The previous prime is 19964933. The next prime is 19964969. The reversal of 19964947 is 74946991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19964947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19964947.

It is not a weakly prime, because it can be changed into another prime (19964447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982473 + 9982474.

It is an arithmetic number, because the mean of its divisors is an integer number (9982474).

Almost surely, 2^19964947 is an apocalyptic number.

19964947 is a deficient number, since it is larger than the sum of its proper divisors (1).

19964947 is an equidigital number, since it uses as much as digits as its factorization.

19964947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 19964947 is about 4468.2151917740. The cubic root of 19964947 is about 271.2830881224.

The spelling of 19964947 in words is "nineteen million, nine hundred sixty-four thousand, nine hundred forty-seven".