19440643471 has 8 divisors (see below), whose sum is σ = 20619895680. Its totient is φ = 18265356288.

The previous prime is 19440643367. The next prime is 19440643501. The reversal of 19440643471 is 17434604491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19440643471 - 2¹⁹ = 19440119183 is a prime.

It is a super-3 number, since 3×19440643471³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440643571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981151 + ... + 1000768.

It is an arithmetic number, because the mean of its divisors is an integer number (2577486960).

Almost surely, 2^19440643471 is an apocalyptic number.

19440643471 is a deficient number, since it is larger than the sum of its proper divisors (1179252209).

19440643471 is a wasteful number, since it uses less digits than its factorization.

19440643471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982513.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 19440643471 in words is "nineteen billion, four hundred forty million, six hundred forty-three thousand, four hundred seventy-one".