19914647 has 2 divisors, whose sum is σ = 19914648. Its totient is φ = 19914646.

The previous prime is 19914607. The next prime is 19914649. The reversal of 19914647 is 74641991.

It is a strong prime.

It is an emirp because it is prime and its reverse (74641991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19914647 - 2¹⁶ = 19849111 is a prime.

Together with 19914649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19914649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9957323 + 9957324.

It is an arithmetic number, because the mean of its divisors is an integer number (9957324).

Almost surely, 2^19914647 is an apocalyptic number.

19914647 is a deficient number, since it is larger than the sum of its proper divisors (1).

19914647 is an equidigital number, since it uses as much as digits as its factorization.

19914647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 19914647 is about 4462.5829964271. The cubic root of 19914647 is about 271.0550715727.

The spelling of 19914647 in words is "nineteen million, nine hundred fourteen thousand, six hundred forty-seven".