19440343779 has 16 divisors (see below), whose sum is σ = 26254686720. Its totient is φ = 12793191840.

The previous prime is 19440343759. The next prime is 19440343823. The reversal of 19440343779 is 97734304491.

It is a de Polignac number, because none of the positive numbers 2^k-19440343779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19440343729) 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 15 ways as a sum of consecutive naturals, for example, 1532049 + ... + 1544685.

It is an arithmetic number, because the mean of its divisors is an integer number (1640917920).

Almost surely, 2^19440343779 is an apocalyptic number.

19440343779 is a deficient number, since it is larger than the sum of its proper divisors (6814342941).

19440343779 is a wasteful number, since it uses less digits than its factorization.

19440343779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19210.

The product of its (nonzero) digits is 2286144, while the sum is 51.

The spelling of 19440343779 in words is "nineteen billion, four hundred forty million, three hundred forty-three thousand, seven hundred seventy-nine".