19894447 has 2 divisors, whose sum is σ = 19894448. Its totient is φ = 19894446.

The previous prime is 19894421. The next prime is 19894487. The reversal of 19894447 is 74449891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19894447 - 2¹¹ = 19892399 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19894397 and 19894406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19894487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9947223 + 9947224.

It is an arithmetic number, because the mean of its divisors is an integer number (9947224).

Almost surely, 2^19894447 is an apocalyptic number.

19894447 is a deficient number, since it is larger than the sum of its proper divisors (1).

19894447 is an equidigital number, since it uses as much as digits as its factorization.

19894447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 46.

The square root of 19894447 is about 4460.3191589840. The cubic root of 19894447 is about 270.9633942468.

The spelling of 19894447 in words is "nineteen million, eight hundred ninety-four thousand, four hundred forty-seven".