19440643327 has 12 divisors (see below), whose sum is σ = 22630083456. Its totient is φ = 16652018880.

The previous prime is 19440643273. The next prime is 19440643351. The reversal of 19440643327 is 72334604491.

It is not a de Polignac number, because 19440643327 - 2²⁷ = 19306425599 is a prime.

It is a super-2 number, since 2×19440643327² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440643367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62778 + ... + 206935.

It is an arithmetic number, because the mean of its divisors is an integer number (1885840288).

Almost surely, 2^19440643327 is an apocalyptic number.

19440643327 is a deficient number, since it is larger than the sum of its proper divisors (3189440129).

19440643327 is a wasteful number, since it uses less digits than its factorization.

19440643327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271198 (or 271191 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 19440643327 in words is "nineteen billion, four hundred forty million, six hundred forty-three thousand, three hundred twenty-seven".