19397685443 has 4 divisors (see below), whose sum is σ = 19526147088. Its totient is φ = 19269223800.

The previous prime is 19397685407. The next prime is 19397685481. The reversal of 19397685443 is 34458679391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34458679391 = 43 ⋅801364637.

It is a cyclic number.

It is not a de Polignac number, because 19397685443 - 2⁸ = 19397685187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19397685343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64230596 + ... + 64230897.

It is an arithmetic number, because the mean of its divisors is an integer number (4881536772).

Almost surely, 2^19397685443 is an apocalyptic number.

19397685443 is a deficient number, since it is larger than the sum of its proper divisors (128461645).

19397685443 is a wasteful number, since it uses less digits than its factorization.

19397685443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128461644.

The product of its digits is 19595520, while the sum is 59.

The spelling of 19397685443 in words is "nineteen billion, three hundred ninety-seven million, six hundred eighty-five thousand, four hundred forty-three".