19398641 has 2 divisors, whose sum is σ = 19398642. Its totient is φ = 19398640.

The previous prime is 19398569. The next prime is 19398647. The reversal of 19398641 is 14689391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18524416 + 874225 = 4304^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 19398641 - 2¹⁰ = 19397617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19398647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9699320 + 9699321.

It is an arithmetic number, because the mean of its divisors is an integer number (9699321).

Almost surely, 2^19398641 is an apocalyptic number.

It is an amenable number.

19398641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19398641 is an equidigital number, since it uses as much as digits as its factorization.

19398641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 19398641 is about 4404.3888338792. The cubic root of 19398641 is about 268.6934637880.

The spelling of 19398641 in words is "nineteen million, three hundred ninety-eight thousand, six hundred forty-one".