19440027690 has 16 divisors (see below), whose sum is σ = 46656066528. Its totient is φ = 5184007376.

The previous prime is 19440027679. The next prime is 19440027721. The reversal of 19440027690 is 9672004491.

It is a super-2 number, since 2×19440027690² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324000432 + ... + 324000491.

It is an arithmetic number, because the mean of its divisors is an integer number (2916004158).

Almost surely, 2^19440027690 is an apocalyptic number.

19440027690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19440027690 is an abundant number, since it is smaller than the sum of its proper divisors (27216038838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19440027690 is a wasteful number, since it uses less digits than its factorization.

19440027690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648000933.

The product of its (nonzero) digits is 108864, while the sum is 42.

The spelling of 19440027690 in words is "nineteen billion, four hundred forty million, twenty-seven thousand, six hundred ninety".