19440641727 has 18 divisors (see below), whose sum is σ = 30407159952. Its totient is φ = 11963470896.

The previous prime is 19440641719. The next prime is 19440641729. The reversal of 19440641727 is 72714604491.

19440641727 is a `hidden beast` number, since 194 + 40 + 6 + 417 + 2 + 7 = 666.

It is not a de Polignac number, because 19440641727 - 2³ = 19440641719 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440641729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6389223 + ... + 6392264.

It is an arithmetic number, because the mean of its divisors is an integer number (1689286664).

Almost surely, 2^19440641727 is an apocalyptic number.

19440641727 is a deficient number, since it is larger than the sum of its proper divisors (10966518225).

19440641727 is a wasteful number, since it uses less digits than its factorization.

19440641727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12781519 (or 12781503 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 19440641727 in words is "nineteen billion, four hundred forty million, six hundred forty-one thousand, seven hundred twenty-seven".